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 A171831 #11 Sep 08 2022 08:45:50 %S A171831 2,5,7,29,37,79,89,97,107,109,127,139,149,197,229,239,277,317,379,397, %T A171831 487,499,509,557,587,599,607,757,769,887,907,1019,1049,1069,1097,1297, %U A171831 1307,1439,1499,1559,1567,1609,1619,1637,1667,1709,1759,1847,1979,1997 %N A171831 Primes p such that p and 3*p^2+3*p-1 are both prime. %H A171831 Vincenzo Librandi, <a href="/A171831/b171831.txt">Table of n, a(n) for n = 1..1000</a> %t A171831 Select[Prime[Range[500]],PrimeQ[3#^2+3#-1]&] (* _Harvey P. Dale_, Jul 24 2011 *) %o A171831 (Magma) [p: p in PrimesUpTo(2000) | IsPrime(3*p^2+3*p-1)]; // _Vincenzo Librandi_, Dec 31 2013 %K A171831 nonn,easy %O A171831 1,1 %A A171831 _Vincenzo Librandi_, Dec 19 2009