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 A153812 #7 Sep 08 2022 08:45:40 %S A153812 5,11,59,79,89,109,131,191,199,241,269,359,389,431,439,661,691,829, %T A153812 859,1019,1109,1181,1249,1319,1439,1621,1759,1789,1831,1949,1979,2011, %U A153812 2081,2111,2179,2341,2371,2389,2441,2459,2671,2699,2861,2999,3169,3229,3251 %N A153812 Primes p such that 6*p^2+1 is also prime. %H A153812 Vincenzo Librandi, <a href="/A153812/b153812.txt">Table of n, a(n) for n = 1..1000</a> %e A153812 For prime p = 199, 6*p^2+1 = 237607 is prime. %t A153812 Select[Prime[Range[500]], PrimeQ[(6 #^2 + 1)]&] (* _Vincenzo Librandi_, Apr 14 2013 *) %o A153812 (Magma) [ p: p in PrimesUpTo(3300) | IsPrime(6*p^2+1) ]; %Y A153812 Cf. A052291 (primes p such that 4p^2 + 1 is also prime). %K A153812 nonn,easy %O A153812 1,1 %A A153812 _Klaus Brockhaus_, Jan 01 2009