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 Showing results 1 to 25 of 1000 Search took 0.37 seconds. Search: Posts Made By: Batalov
 Forum: Wagstaff PRP Search 2021-09-20, 19:33 Replies: 4 Views: 5,155 Posted By Batalov Use (a-b)(a+b) = a2 - b2 and Bob's your uncle. Use (a-b)(a+b) = a2 - b2 and Bob's your uncle.
 2021-09-17, 17:49 Replies: 5 Views: 146 Posted By Batalov ...but 10^(n)-epsilon has n digits And of... ...but 10^(n)-epsilon has n digits And of course, the only palindrome prime that has an even number of digits (in any base, actually) is "11"! (And even "11" can be composite; then none.) All...
 Forum: NFS@Home 2021-09-16, 16:33 Replies: 33 Views: 3,660 Posted By Batalov 8p3_930M is done Thu Sep 16 01:02:09 2021 p88 factor: 8140818645611617140423189084010180374627188803000899172278298237756498599357784319269741 p100 factor:...
 Forum: Riesel Prime Search 2021-09-15, 21:52 Replies: 267 Views: 46,786 Posted By Batalov When I was already way into sieving, I thought... When I was already way into sieving, I thought that I should have picked 1234321 decimal digits length :rolleyes: But it turned out good. With 1234567 digits' dataset the hit came, statistically...
 Forum: Riesel Prime Search 2021-09-15, 16:06 Replies: 267 Views: 46,786 Posted By Batalov Prof.Caldwell's calculator had insufficient... Prof.Caldwell's calculator had insufficient precision. I'll drop him a note. It is, of course, 1234567. All palindromes of even length (except 11) are composite! :rolleyes: Hint: they are...
 Forum: No Prime Left Behind 2021-09-15, 00:06 Replies: 1,515 Views: 210,121 Posted By Batalov That was lucky! In a couple days it wouldn't... That was lucky! In a couple days it wouldn't have fit. Now it will stay there forever :beer2:
 Forum: Riesel Prime Search 2021-09-14, 20:08 Replies: 267 Views: 46,786 Posted By Batalov Another Riesel "other" number is coming soon. ... Another Riesel "other" number is coming soon. It is a palindrome, chock full of "9"s (with a few others) and is neatly 1,234,567 decimal digits long
 Forum: Lounge 2021-09-14, 19:58 Replies: 1,779 Views: 179,434 Posted By Batalov Norman Macdonald, a Canadian stand-up comedian... Norman Macdonald, a Canadian stand-up comedian (https://en.wikipedia.org/wiki/Norm_Macdonald)
 Forum: NFS@Home 2021-09-14, 05:58 Replies: 33 Views: 3,660 Posted By Batalov Fib(1409) is done Mon Sep 13 21:49:33 2021 ... Fib(1409) is done Mon Sep 13 21:49:33 2021 p64 factor: 1645314853783969974409864778570205738354678434910357950092999577 p161 cofactor: 1263615066...54657241 edS1VXSa
 Forum: NFS@Home 2021-09-12, 23:58 Replies: 45 Views: 8,037 Posted By Batalov 8p3_930M is in LA; small; just a 2-days worth... 8p3_930M is in LA; small; just a 2-days worth job. Can be moved to 'Post processing'. Fib 1409 will finish first (ETA tomorrow)
 2021-09-12, 23:38 Replies: 53 Views: 21,326 Posted By Batalov There is a great guy who does Lingua Latina... There is a great guy who does Lingua Latina channel and recently he had two excellent experiments: DYYpTfx1ey8 fDhEzP0b-Wo
 Forum: PrimeNet 2021-09-12, 05:23 Replies: 35 Views: 1,714 Posted By Batalov :direction: :direction:
 Forum: Riesel Prime Search 2021-09-11, 10:44 Replies: 267 Views: 46,786 Posted By Batalov Two largest known less-than-Mega primes,... Two largest known less-than-Mega primes, actually. (The second one was found before search was called off, an incidental finding. :rolleyes: ) ... 10^999999+308267*10^292000+1 P 1000000 ...
 Forum: Aliquot Sequences 2021-09-10, 05:59 Replies: 3,575 Views: 361,132 Posted By Batalov Take 2525664 Take 2525664
 Forum: Aliquot Sequences 2021-09-09, 07:40 Replies: 3,575 Views: 361,132 Posted By Batalov Take 1730616 Take 1730616
 Forum: Puzzles 2021-09-06, 18:07 Replies: 58 Views: 1,495 Posted By Batalov The final touch is using solve(x=A,B,f(x)) ... The final touch is using solve(x=A,B,f(x)) Bracket the root [A,B], set the wanted precision \p 50 and it will solve it.
 Forum: NFS@Home 2021-09-05, 21:12 Replies: 33 Views: 3,660 Posted By Batalov I can finish 8p3_930M octic I can finish 8p3_930M octic
 Forum: NFS@Home 2021-09-05, 20:12 Replies: 45 Views: 8,037 Posted By Batalov Fibonacci(1409) is in LA, so we don't need to... Fibonacci(1409) is in LA, so we don't need to wait for 4000+ straggler rejects due to the race of lemmings... Can be moved to 'Post processing'
 Forum: Puzzles 2021-09-05, 01:10 Replies: 58 Views: 1,495 Posted By Batalov /gasp/ ...you couldn't just solve it... /gasp/ ...you couldn't just solve it analytically? In Russian there is a saying, "To shoot sparrows with a cannon". That's what's going on here.
 Forum: NFS@Home 2021-09-03, 06:33 Replies: 1,849 Sticky: BOINC NFS sieving - NFS@Home Views: 155,690 Posted By Batalov We could do some more Fibs and Lucas's, maybe?... We could do some more Fibs and Lucas's, maybe? Their polynomials are frequently easily reused from their lesser siblings without any retraining. E.g. L1373 c272.
 Forum: Puzzles 2021-09-01, 00:48 Replies: 58 Views: 1,495 Posted By Batalov It seems that the visitors of this thread, after... It seems that the visitors of this thread, after this trivial warmup, are now ripe to admire the real beauty. Behold! -- The couch problem (https://en.wikipedia.org/wiki/Moving_sofa_problem) ...
 Forum: Miscellaneous Math 2021-08-28, 20:55 Replies: 21 Views: 875 Posted By Batalov I can only add another illustrative vignette - ... I can only add another illustrative vignette - Interestingly (c), 21278-1 is fully factored (http://factordb.com/index.php?query=2%5E1278-1). But how can that be without the help of factoring...
 Forum: Miscellaneous Math 2021-08-28, 19:13 Replies: 21 Views: 875 Posted By Batalov You, actually, appear to be assuming the worst in... You, actually, appear to be assuming the worst in others. I almost always apply Hanlon's_razor (https://en.wikipedia.org/wiki/Hanlon%27s_razor). My remark had nothing to do with you but with your...
 Forum: Information & Answers 2021-08-28, 18:14 Replies: 32 Views: 5,982 Posted By Batalov Irrelevant fodder moved to "I am experimenting... Irrelevant fodder moved to "I am experimenting with heuristic sieves." (https://www.mersenneforum.org/showthread.php?t=27107)
 Forum: Miscellaneous Math 2021-08-28, 18:07 Replies: 21 Views: 875 Posted By Batalov O RLY? Ever heard of x2-1 = ... ? (write it... O RLY? Ever heard of x2-1 = ... ? (write it out, don't be shy) x11-1 = ... ? (write it out) There is so much "interesting" in the world to anyone who skipped all classes in the 7th grade.
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