OEIS A071580: Smallest prime of the form k*a(n-1)*a(n-2)*...*a(1)+1 - Page 2

axn · 2015-05-22, 04:32

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)

Stargate38 · 2015-05-22, 21:23

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.

Batalov · 2015-05-22, 22:06

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").

arbooker · 2015-05-22, 23:18

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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2015-05-22, 21:23	#13
Stargate38 "Daniel Jackson" May 2011 14285714285714285714 663₁₀ 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 3⁶·13 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").