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Old 2011-06-21, 19:55   #232
roger
 
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Oct 2006

22×5×13 Posts
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Part 2:
Code:
12500	26208615
12501	34531851
12502	254068527
12503	55382025
12504	92237043
12505	28748145
12506	54455457
12507	131373321
12508	59029497
12509	50916375
12510	67153497
12511	31897725
12512	133003737
12513	63210681
12514	44877345
12515	430521
12516	92853945
12517	59205351
12518	71384853
12519	41514435
12520	31328625
12521	75927765
12522	84022773
12523	4293669
12524	35952447
12525	90588879
12526	136568157
12527	38310549
12528	34740645
12529	58229325
12530	53220237
12531	485349
12532	61627383
12533	36106545
12534	68245965
12535	89512179
12536	73318455
12537	9193551
12538	124723893
12539	38319519
12540	75950703
12541	49528515
12542	31214313
12543	366544239
12544	95075553
12545	86999679
12546	53035887
12547	83817201
12548	78979197
12549	9171741
12550	46932003
12551	155818809
12552	131066355
12553	36157605
12554	31456503
12555	128707539
12556	71849433
12557	45758811
12558	116343573
12559	55645305
12560	1081737
12561	47835531
12562	9009387
12563	115529271
12564	7933443
12565	9635961
12566	8061777
12567	16295085
12568	42399183
12569	52443369
12570	13501233
12571	275710059
12572	17268063
12573	33120549
12574	7432497
12575	169274811
12576	346316787
12577	6567441
12578	8033985
12579	38281155
12580	60882165
12581	21576339
12582	128098467
12583	9874515
12584	59347743
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12588	127490487
12589	20966505
12590	44177223
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12592	54057975
12593	3885795
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12595	79256241
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12597	7860381
12598	88721205
12599	8889075
12600	6500673
12601	28486095
12602	162063933
12603	139755189
12604	269106315
12605	17481549
12606	245606613
12607	10041981
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12609	133248339
12610	77673273
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12612	47810157
12613	19190361
12614	21383355
12615	92046099
12616	64850427
12617	125329275
12618	16476807
12619	14666121
12620	34339767
12621	32730135
12622	11058195
12623	2609949
12624	8227377
12625	69966219
12626	18070587
12627	3281421
12628	56965347
12629	20202585
12630	96583197
12631	591435
12632	7174947
12633	48465351
12634	55131027
12635	15033915
12636	4409127
12637	69862989
12638	73392045
12639	240965919
12640	43867965
12641	11988591
12642	327335883
12643	68428905
12644	22233963
12645	177732009
12646	20008143
12647	47690889
12648	221332857
12649	48630519
12650	241367223
12651	28121655
12652	44210655
12653	10272945
12654	9036885
12655	85811145
12656	56625723
12657	45077961
12658	160404225
12659	32716365
12660	17296545
12661	2689455
12662	11058783
12663	7590231
12664	5982795
12665	13937979
12666	72157263
12667	623841
12668	604635
12669	30681735
12670	184456893
12671	8094111
12672	17189805
12673	43521129
12674	75846687
12675	4701141
12676	66725085
12677	134552925
12678	38392125
12679	51270585
12680	257289483
12681	156478695
12682	211011495
12683	20781351
12684	29962173
12685	100969455
12686	14505525
12687	6412485
12688	32701053
12689	105582459
12690	78568635
12691	12434409
12692	4135575
12693	6723495
12694	15010275
12695	8885661
12696	76307103
12697	6283761
12698	32011143
12699	27782781
12700	1483203
12701	163579875
12702	42413025
12703	13852341
12704	44617965
12705	3501099
12706	359781183
12707	204703299
12708	216331395
12709	15736695
12710	52439253
12711	39301119
12712	5309817
12713	60473865
12714	11975565
12715	23591181
12716	78669423
12717	163070301
12718	155447523
12719	122309061
12720	54616005
12721	154433979
12722	2119167
12723	77561025
12724	19458087
12725	6786615
12726	63633315
12727	34320951
12728	81317775
12729	57856965
12730	154061985
12731	25282851
12732	105701295
12733	16701531
12734	9051417
12735	212445315
12736	25050087
12737	191935509
12738	111781455
12739	24318915
12740	116168643
12741	59008281
12742	35285853
12743	54235929
12744	1307325
12745	12062211
12746	67159155
12747	39105141
12748	5391015
12749	43878999
12750	3081243
12751	14937075
12752	348848787
12753	35551491
12754	23101713
12755	59208321
12756	162222123
12757	111544431
12758	134033595
12759	18652965
12760	33644757
12761	105413169
12762	21809013
12763	1600725
12764	4996863
12765	21610551
12766	130170087
12767	10100931
12768	31473627
12769	175276491
12770	5433057
12771	18123459
12772	106204113
12773	15000219
12774	73711635
12775	14220159
12776	10730397
12777	36970155
12778	117731355
12779	182435085
12780	50223255
12781	9061269
12782	136129515
12783	45236685
12784	129750273
12785	61496655
12786	38617005
12787	58648875
12788	70333287
12789	38344731
12790	38540817
12791	21826869
12792	52720155
12793	14532435
12794	28971495
12795	52181895
12796	36191175
12797	101305035
12798	126225417
12799	131962935
12800	67459035
12801	32456931
12802	61222275
12803	11999655
12804	3183267
12805	316455
12806	137061543
12807	64613685
12808	11716677
12809	10513041
12810	92246073
12811	43493991
12812	18018297
12813	86871015
12814	171685305
12815	5158035
12816	136924263
12817	12094929
12818	57032493
12819	163826649
12820	17623887
12821	14335131
12822	19676037
12823	82711641
12824	116542623
12825	2814081
12826	53631915
12827	40614339
12828	125382435
12829	176680071
12830	3982737
12831	14005089
12832	100036893
12833	51233619
12834	173926263
12835	49549071
12836	84119157
12837	7650045
12838	10356747
12839	15187635
12840	40028895
12841	54859761
12842	53586303
12843	117608001
12844	25771233
12845	16647651
12846	19720407
12847	79537689
12848	45601125
12849	85472595
12850	6802353
12851	57449049
12852	63134223
12853	1527525
12854	41695893
12855	150599589
12856	737037
12857	13004361
12858	12097803
12859	331166529
12860	127549143
12861	88092315
12862	62475723
12863	10119879
12864	72424545
12865	2332755
12866	29285367
12867	5462499
12868	157454295
12869	48224235
12870	2252463
12871	37257099
12872	178399833
12873	1240575
12874	34251957
12875	41759259
12876	4412583
12877	4121991
12878	37483785
12879	37505739
12880	8739045
12881	2460735
12882	52186113
12883	97203195
12884	153400983
12885	84962559
12886	50352777
12887	26814735
12888	66856155
12889	27551019
12890	4041033
12891	38193705
12892	26137665
12893	58218105
12894	3140517
12895	15822441
12896	32194977
12897	17900739
12898	68696223
12899	60627189
12900	150574125
12901	185248449
12902	2704395
12903	24311961
12904	59337285
12905	10164099
12906	5107347
12907	20065215
12908	21356373
12909	47195769
12910	116093175
12911	288163791
12912	59691573
12913	34558329
12914	31622625
12915	26582349
12916	59067813
12917	262702485
12918	14823753
12919	25074285
12920	1957437
12921	22001451
12922	599775
12923	20047755
12924	40402113
12925	106291599
12926	3428655
12927	10617525
12928	21107295
12929	15006195
12930	187090473
12931	60506685
12932	35883795
12933	12955695
12934	69586425
12935	63563451
12936	92054037
12937	20458779
12938	42286623
12939	32877735
12940	36698193
12941	192723069
12942	11821113
12943	24452829
12944	9401595
12945	7506921
12946	131146023
12947	37418265
12948	4291947
12949	7012629
12950	71831325
12951	4784409
12952	27262605
12953	47015025
12954	9898845
12955	52520001
12956	16014447
12957	183929601
12958	48837297
12959	16994121
12960	74954955
12961	12252891
12962	55353357
12963	9485145
12964	40421967
12965	195923175
12966	36528495
12967	50267481
12968	74539125
12969	19929009
12970	240260643
12971	156631209
12972	2778183
12973	25792005
12974	52013373
12975	2486985
12976	37646055
12977	16880661
12978	62178543
12979	49970481
12980	104945205
12981	33333675
12982	117841695
12983	146510001
12984	90007857
12985	40285545
12986	20130267
12987	95511981
12988	12854613
12989	417880719
12990	139840545
12991	4869201
12992	4380363
12993	13607541
12994	53088435
12995	6417891
12996	34661883
12997	222050571
12998	208540863
12999	36785331
new jumping champion 12989 at 417880719 (doublechecking just to be sure)

A short history of twins found per pass:
pass 1->10:
0-1M, 1-5M, 5-10M, 10-25M, 25-50M, 50-100M, 100-200M, 200-300M, 300-400M, 400-500M.

Code:
    n=	10-11k	11-12k	12-13k	13-14k
1	30	17	16	10
2	88	72	80	71
3	117	94	80	67
4	230	229	182	144
5	244	239	225	205
6	181	200	238	284
7	100	128	140	
8	8	20	32	
9	2	1	6	
10	0	0	1	
(13-14k still unfinished)
Comparison of total time to find complete set of 1000 twins:

10-11k: 1611.4 CPU hours
11-12k: 2523.9 CPU hours
12-13k: 3111.0 CPU hours

CPU is a quadcore 2.9GHz, don't know what chip specifically.


13000<n<14000 k<1e8 done
13000<n<14000 1e8<k<2e8 44.9% done
total: 84.7% done.

14000<n<15000 k<2.5e7 done
14000<n<15000 2.5e7<k<5e7 20% done
total: 31.3% done.

Last fiddled with by roger on 2011-06-21 at 19:57
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Old 2011-06-22, 08:03   #233
kar_bon
 
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Mar 2006
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Thanks for more data, I try to update my page the next days.

I forgot to say this last time:

It's easier to put your list in a file and attach it here.
Easier to read the post (and more to reply on it) and easier for me to handle such list (download).
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Old 2011-08-07, 00:14   #234
roger
 
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More:

13000<n<14000 done (see attached file)

14000<n<15000 k<5e7 done
14000<n<15000 k<1e8 22% done
total 52.1% done

15000<n<16000 k<1e7 done
15000<n<16000 k<2.5e7 53% done
total 20.7% done
Attached Files
File Type: txt Twins_13k.txt (15.7 KB, 109 views)
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Old 2011-08-09, 17:03   #235
kar_bon
 
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Mar 2006
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I've inserted all 12000 ≤ n ≤ 14000 in my page for smallest k-values as twins of k*2^n-1.
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Old 2011-10-16, 08:11   #236
roger
 
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update:

14000<n<15000 k<1e8 done
14000<n<15000 1e8<k<2e8 79% done
total: 84.7% done.

15000<n<16000 k<5e7 done
total: 43.5% done.

16000<n<17000 k<1e7 done
16000<n<17000 1e7<k<2.5e7 45% done
total: 15.6% done.

total twins found: 15553
% to n=15000: 98.98%
% to n=20000: 77.33%
% to n=25000: 61.97%
% to n=30000: 51.69%
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Old 2011-10-17, 23:15   #237
SaneMur
 
Jul 2011

11710 Posts
Default Accidental twins

Today I found a set of twins by accident.

28,000,000,000,079
28,000,000,000,081

Probably not earth-shattering in terms of size, but what luck playing around with a prime calculator on the web.
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Old 2011-11-27, 08:35   #238
roger
 
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14k<n<15k done (file attached)
time taken (cpu hrs): 5781.7

15000<n<16000 k<5e7 done.
15000<n<16000 5e7<k<1e8 54% done
total: 55% done.

16000<n<17000 k<1e7 done.
16000<n<17000 1e7<k<5e7 81% done
total: 21.3% done.
Attached Files
File Type: txt 14-15k.txt (15.8 KB, 253 views)
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Old 2012-04-10, 21:14   #239
roger
 
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Small update (been running this project on the back burner)

15000<n<16000 k>2e8 done.
15000<n<16000 2e8<k<3e8 90% done
total: 95.9% done.

also: 3124593081*2^83047+-1 is prime (5th largest on my chart so far)
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Old 2012-04-24, 21:46   #240
roger
 
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15000<n<16000 done:
Attached Files
File Type: txt 15k.txt (15.8 KB, 96 views)
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Old 2012-04-25, 16:00   #241
Cybertronic
 
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DEUTSCHLAND !

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Congratulation !

124121439*2^15541+d ; d=-5,-1,+1 is a 4679 digit triplet ! Place 7.

Best
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Old 2012-04-26, 06:28   #242
MooMoo2
 
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Aug 2010

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Look what I found a short while ago:

84966861*2^140219-1 is prime! Time : 33.905 sec.
84966861*2^140219+1 is prime! Time : 34.592 sec.

This enters the Prime Pages as the 10th largest known twin:
http://primes.utm.edu/top20/page.php?id=1
http://primes.utm.edu/primes/page.php?id=106537
http://primes.utm.edu/primes/page.php?id=106538

This project deserves (and got) some credit since it gave me the idea to search a low k, variable-n range. In the end, it paid off
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