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 A256775 #18 Sep 08 2022 08:46:11 %S A256775 97,181,277,337,757,1237,2017,3217,4177,5557,5857,6481,7477,11317, %T A256775 13537,16981,19681,21397,33937,37717,48481,51157,52981,59617,62581, %U A256775 65617,80737,84181,87697,96181,102481,106357,111637,119797,144481,149077,155317,160081 %N A256775 Primes of the form n^2 + 81. %C A256775 Conjecture: sequence is infinite. %H A256775 Reinhard Zumkeller, <a href="/A256775/b256775.txt">Table of n, a(n) for n = 1..10000</a> %t A256775 Select[Range[400]^2 + 81, PrimeQ] (* _Michael De Vlieger_, Apr 19 2015 *) %o A256775 (Haskell) %o A256775 a256775 n = a256775_list !! (n-1) %o A256775 a256775_list = [x | x <- map (+ 81) a000290_list, a010051' x == 1] %o A256775 (Magma) [p: p in PrimesUpTo(200000)| IsSquare(p-81)]; // _Vincenzo Librandi_, Apr 20 2015 %o A256775 (PARI) for(n=1,10^3,if(isprime(p=n^2+81),print1(p,", "))) \\ _Derek Orr_, Apr 24 2015 %Y A256775 subsequence of A045349. %Y A256775 Cf. A010051, A000290; subsequence of A028916. %Y A256775 Primes of form n^2+b^4, b fixed: A002496 (b=1), A243451 (b=2), A256776 (b=4), A256777 (b=5), A256834 (b=6), A256835 (b=7), A256836 (b=8), A256837 (b=9), A256838 (b=10), A256839 (b=11), A256840 (b=12), A256841 (b=13). %K A256775 nonn %O A256775 1,1 %A A256775 _Reinhard Zumkeller_, Apr 11 2015