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 A172122 #11 Sep 08 2022 08:45:50 %S A172122 2,5,17,29,59,197,227,257,317,359,467,509,569,587,797,929,1097,1187, %T A172122 1259,1307,1439,1637,1697,1847,1877,1997,2027,2069,2099,2237,2297, %U A172122 2399,2459,2477,2657,2687,2729,2939,3167,3359,3407,3467,3659,3677,4019,4079 %N A172122 Primes p such that 7*p^2+7*p+1 is also prime. %H A172122 Vincenzo Librandi, <a href="/A172122/b172122.txt">Table of n, a(n) for n = 1..1000</a> %t A172122 Select[Prime[Range[3000]], PrimeQ[7 #^2 + 7 # + 1]&] (* _Vincenzo Librandi_, Apr 16 2013 *) %o A172122 (Magma) [p: p in PrimesUpTo(4100) | IsPrime(7*p^2 + 7*p + 1)]; // _Vincenzo Librandi_, Apr 16 2013 %Y A172122 Cf. A171139. %K A172122 nonn,easy %O A172122 1,1 %A A172122 _Vincenzo Librandi_, Jan 26 2010