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 A258805 #18 Jul 07 2025 18:27:01 %S A258805 2,257,65537,37588592026706177,92170395205042177,147578905600000001, %T A258805 284936905588473857,3503536769037500417,11007531417600000001, %U A258805 11763130845074473217,47330370277129322497,50024641296100000001,76872571987558646017,416806419029812551937 %N A258805 Primes of the form k^8 + 1. %H A258805 Charles R Greathouse IV, <a href="/A258805/b258805.txt">Table of n, a(n) for n = 1..10000</a> %F A258805 a(n) = A060890(A006314(n)). - _Michel Marcus_, Jun 11 2015 %t A258805 Select[Range[500]^8 + 1, PrimeQ] %o A258805 (Magma) [a: n in [1..500] | IsPrime(a) where a is n^8+1]; %o A258805 (PARI) is(n)=ispower(n-1,8) && isprime(n) \\ _Charles R Greathouse IV_, Jun 11 2015 %Y A258805 Subsequence of A002496, A037896. %Y A258805 Cf. A006314 (associated n), A060890. %K A258805 nonn,easy %O A258805 1,1 %A A258805 _Vincenzo Librandi_, Jun 11 2015