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 Showing results 1 to 19 of 19 Search took 0.01 seconds. Search: Posts Made By: ericw
 2017-11-20, 14:02 Replies: 22 Views: 15,813 Posted By ericw (Actually 260448 decimal digits.) ... (Actually 260448 decimal digits.) Congratulations again :)
 2017-08-11, 14:47 Replies: 22 Views: 15,813 Posted By ericw https://oeis.org/A100289 Numbers n such that... https://oeis.org/A100289 Numbers n such that (1!)^2 + (2!)^2 + (3!)^2 +...+ (n!)^2 is prime. a(19) = 32841 from Serge Batalov, Jul 29 2017
 2017-02-20, 12:13 Replies: 27 Views: 6,523 Posted By ericw Cool. Thanks for the update! Cool. Thanks for the update!
 2017-02-02, 15:23 Replies: 27 Views: 6,523 Posted By ericw FWIW, back on 2009-06-03, I used Mathematica to... FWIW, back on 2009-06-03, I used Mathematica to show PrimeQ[FromDigits[First[RealDigits[GoldenRatio, 10, 97241]]]] True See http://mathworld.wolfram.com/IntegerSequencePrimes.html (under...
 2016-06-20, 01:55 Replies: 32 Views: 8,458 Posted By ericw Thanks again for your hunting and for the... Thanks again for your hunting and for the updates! Will update MathWorld.
 2016-04-11, 14:43 Replies: 32 Views: 8,458 Posted By ericw Thanks again. Small clarification: does that mean... Thanks again. Small clarification: does that mean you have *already* reached 465,000 and have now stopped, or that you expect to do so soon? (Basically, should I update MathWorld yet.)
 2016-02-15, 12:52 Replies: 32 Views: 8,458 Posted By ericw Cool. Thanks again for continuing the search and... Cool. Thanks again for continuing the search and providing an update on your progress!
 2016-01-18, 17:05 Replies: 32 Views: 8,458 Posted By ericw Thanks for the update, Mark. Will update... Thanks for the update, Mark. Will update MathWorld.
 2015-12-21, 13:56 Replies: 32 Views: 8,458 Posted By ericw 32 CPU-hours on moderately old hardware. (PrimeQ... 32 CPU-hours on moderately old hardware. (PrimeQ uses a multiple Rabin-Miller test in bases 2 and 3 combined with a Lucas pseudoprime test.)
 2015-12-17, 11:50 Replies: 32 Views: 8,458 Posted By ericw Verified also using Mathematica's PrimeQ (returns... Verified also using Mathematica's PrimeQ (returns True -> probable prime) Congratulations!
 2015-12-08, 14:54 Replies: 32 Views: 8,458 Posted By ericw Thanks for posting these updates Mark. ... Thanks for posting these updates Mark. Unfortunately, I am still having a problem understanding your limits. Concatenating all primes < 550,000 gives an integer with In[4]:= Total[IntegerLength...
 2015-11-20, 14:02 Replies: 32 Views: 8,458 Posted By ericw (FWIW, https://oeis.org/A227530 gives the decimal... (FWIW, https://oeis.org/A227530 gives the decimal digit lengths of Copland-Erdos constant primes.)
 2015-11-20, 14:01 Replies: 32 Views: 8,458 Posted By ericw By any chance should that be "all primes <... By any chance should that be "all primes < 30,000"? In[6]:= Total[IntegerLength[Prime[Range[30000]]]] Out[6]= 168982
 2015-11-10, 15:55 Replies: 21 Views: 3,630 Posted By ericw Nice. I will update MathWorld. Do you care to... Nice. I will update MathWorld. Do you care to polish off 48250 to 49999 while you're at it (since clearly your search will finish way before mine gets there).
 2015-11-03, 18:32 Replies: 21 Views: 3,630 Posted By ericw Perfect. Thank you. Perfect. Thank you.
 2015-11-03, 14:18 Replies: 21 Views: 3,630 Posted By ericw Indeed. Another question for Paul or anyone else... Indeed. Another question for Paul or anyone else (I am having trouble rejoining primeform on Yahoo groups to ask there.) I see PrimeGrid has been busily finding new Thabit ibn Kurrah primes 3*2^n -...
 2015-11-03, 12:13 Replies: 21 Views: 3,630 Posted By ericw Thanks. Yes, still searching. As of... Thanks. Yes, still searching. As of today the search has reached 47889 47888 ... 3 2 1 without finding any more PRPs.
 2015-11-02, 16:04 Replies: 21 Views: 3,630 Posted By ericw p#-1 and OEIS A057704 It seems https://oeis.org/A057704 2, 3, 5, 6, 13, 24, 66, 68, 167, 287, 310, 352, 564, 590, 620, 849, 1552, 1849 misses recently found large p#-1 primes; cf. e.g....
 2015-11-02, 15:53 Replies: 21 Views: 3,630 Posted By ericw Yes, the comment in question applied to the 1st... Yes, the comment in question applied to the 1st edition but the reference got updated to the 2nd edition, where it no longer applies. Fixed on...
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