This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A309854 #20 Oct 29 2023 22:00:47 %S A309854 6,7,10,12,15,22,34,46,57,60,64,75,81,82,84,94,112,117,129,132,151, %T A309854 160,169,171,175,186,196,210,214,222,225,255,264,292,301,309,315,330, %U A309854 357,364,369,370,379,381,384,400,412,417,426,430,454,474,516,547,549,582,610,631,636,655 %N A309854 Numbers k such that 2*k^5 - 1 is prime. %H A309854 Robert Israel, <a href="/A309854/b309854.txt">Table of n, a(n) for n = 1..10000</a> %p A309854 filter:= k -> isprime(2*k^5-1): %p A309854 select(filter, [$1..1000]); # _Robert Israel_, Oct 29 2023 %o A309854 (PARI) isok(k) = isprime(2*k^5 - 1); \\ _Michel Marcus_, Jul 22 2021 %Y A309854 Cf. A214289 (2*k^3 - 1 prime), A182783 (2*k^4 - 1 prime), A309855 (subset of primes). %K A309854 nonn %O A309854 1,1 %A A309854 _R. J. Mathar_, Aug 20 2019