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 A171138 #6 Sep 08 2022 08:45:49
%S A171138 41,83,2141,2659,3863,6089,15791,31891,37813,66541,90173,160663,
%T A171138 187123,210713,349663,362291,368689,401519,442763,464141,486023,
%U A171138 679223,769243,904679,945391,976513,1061969,1173829,1231859,1315453,1352119,1465141
%N A171138 Primes of the form 7*p^2+7*p-1 (with p=prime).
%H A171138 Vincenzo Librandi, <a href="/A171138/b171138.txt">Table of n, a(n) for n = 1..1000</a>
%t A171138 Select[Table[7p^2 + 7p - 1,{p, Prime[Range[400]]}], PrimeQ] (* _Vincenzo Librandi_, Oct 13 2012 *)
%o A171138 (Magma) [a: p in PrimesInInterval(1, 800) | IsPrime(a) where a is 7*p^2 + 7*p - 1]; // _Vincenzo Librandi_, Oct 13 2012
%Y A171138 Cf. A171139.
%K A171138 nonn,easy
%O A171138 1,1
%A A171138 _Vincenzo Librandi_, Jan 26 2010