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 A260559 #18 Jul 01 2025 21:39:42 %S A260559 2,6,10,36,65,74,78,83,106,115,120,148,161,163,168,176,189,194,197, %T A260559 266,270,288,331,385,399,407,410,412,413,431,468,513,524,546,569,572, %U A260559 578,581,600,611,625,626,647,719,723,756,832,834,849,922,986,1006,1007,1047 %N A260559 Numbers k such that (k^31+1)/(k+1) is prime. %H A260559 Tim Johannes Ohrtmann, <a href="/A260559/b260559.txt">Table of n, a(n) for n = 1..10000</a> %t A260559 Select[Range[1, 10000], PrimeQ[(#^31 + 1)/(# + 1)] &] %o A260559 (PARI) for(n=1,10000, if(isprime((n^31+1)/(n+1)), print1(n,", "))) %o A260559 (Magma) [n: n in [1..10000] |IsPrime((n^31 + 1) div (n + 1))]; %Y A260559 Cf. A055494, A246392, A250174, A250178, A250181, A250185, A250187, A250193, A260558, A260560-A260573. %K A260559 nonn %O A260559 1,1 %A A260559 _Tim Johannes Ohrtmann_, Jul 29 2015