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 A171139 #10 Sep 08 2022 08:45:49 %S A171139 2,3,17,19,23,29,47,67,73,97,113,151,163,173,223,227,229,239,251,257, %T A171139 263,311,331,359,367,373,389,409,419,433,439,457,463,491,503,523,541, %U A171139 563,569,607,701,733,809,853,877,883,941,953,967,983,1013,1033,1049 %N A171139 Primes p such that 7*p^2+7*p-1 is also prime. %H A171139 Vincenzo Librandi, <a href="/A171139/b171139.txt">Table of n, a(n) for n = 1..1000</a> %t A171139 Select[Prime[Range[200]], PrimeQ[7 #^2 + 7 # - 1]&] (* _Vincenzo Librandi_, Apr 16 2013 *) %o A171139 (Magma) [p: p in PrimesUpTo(1050) | IsPrime(7*p^2+7*p-1)]; // _Vincenzo Librandi_, Apr 16 2013 %Y A171139 Cf. A171138. %K A171139 nonn,easy %O A171139 1,1 %A A171139 _Vincenzo Librandi_, Jan 26 2010