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 A352804 #11 Apr 09 2022 09:46:56 %S A352804 2,3,4,6,7,8,11,12,16,17,18,19,21,22,23,26,29,32,36,37,39,41,47,51,56, %T A352804 58,61,66,72,76,82,83,84,87,88,91,92,93,94,99,102,106,111,113,116,117, %U A352804 118,126,131,132,139,142,144,146,149,151,159,162,171,177,179 %N A352804 a(n) = A028876(n)/2; numbers k such that 4*k^2 - 5 is prime. %C A352804 A028876 with common factor 2 removed. %H A352804 Jianing Song, <a href="/A352804/b352804.txt">Table of n, a(n) for n = 1..10000</a> %t A352804 Select[Range[200], PrimeQ[4*#^2 - 5] &] %o A352804 (PARI) isA352804(n)=isprime(4*n^2-5) %Y A352804 Cf. A028876, A028877 (the resulting primes), A352805. %K A352804 nonn,easy %O A352804 1,1 %A A352804 _Jianing Song_, Apr 04 2022