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 A137530 #11 Sep 08 2022 08:45:32 %S A137530 181,1621,6481,8821,35281,52021,58321,87121,103681,112501,131221, %T A137530 141121,151381,172981,184321,302581,380881,414721,450001,486721, %U A137530 544501,626581,691921,737281,784081,808021,1039681,1067221,1240021,1300501,1362421 %N A137530 Primes of the form 5k^2 + 1. %C A137530 All k are multiples of 6, k=6j, where j are numbers in A138218. %t A137530 Select[5*Range[600]^2+1,PrimeQ] (* _Harvey P. Dale_, Dec 06 2015 *) %o A137530 (Magma)[a: n in [0..1000]|IsPrime(a) where a is 1+5*n^2] // _Vincenzo Librandi_, Dec 13 2010 %K A137530 nonn %O A137530 1,1 %A A137530 _Zak Seidov_, Apr 27 2008