mersenneforum.org OEIS A071580: Smallest prime of the form k*a(n-1)*a(n-2)*...*a(1)+1
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2015-05-22, 04:32   #12
axn

Jun 2003

2×5×479 Posts

Quote:
 Originally Posted by axn The smaller of the two has now appeared in Top5000 (http://primes.utm.edu/primes/page.php?id=119934).
And now its bigger brother has also been proved -- this time with a single N-1 pass (http://primes.utm.edu/primes/page.php?id=119933)

 2015-05-22, 21:23 #13 Stargate38     "Daniel Jackson" May 2011 14285714285714285714 23·7·11 Posts Where can I find terms 14-21? I tried OEIS, but it only has 1-13, and The Prime Pages only have 22 and 23. FactorDB doesn't have them either, as far as I know.
 2015-05-22, 22:06 #14 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 25×7×41 Posts See post #9? It has both: 1) all terms ("giving a man a fish"), and 2) advise to register for OEIS Wiki ("teach a man to fish").
2015-05-22, 23:18   #15
arbooker

"Andrew Booker"
Mar 2013

5·17 Posts

Quote:
 Originally Posted by arbooker Good idea. I've done nothing on that sequence, but it wouldn't be hard to adapt my existing sieving code for it.
Here's what I get quick and dirty for the first 19 k-values for A090475:
Code:
3,2,1,1,3,1,4,32,119,77,40,8,777,245,4541,349,1381,10762,10492
I would be grateful if someone could check these to make sure I haven't made any (more) stupid mistakes. I'll proceed with the computation of the next few terms, but it might take a while since I have a few other projects going.

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