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 A106066 #16 Sep 08 2022 08:45:17 %S A106066 3,23,41,47,53,59,107,131,137,173,179,191,251,263,293,311,443,467,503, %T A106066 599,641,971,977,1013,1049,1151,1277,1301,1307,1409,1427,1433,1451, %U A106066 1559,1607,1721,1913,1973,1979,2069,2111,2141,2267,2417,2693,2729,2777,2999 %N A106066 Primes p such that 1*p+20 and 20*p+1 are primes. %t A106066 Select[Prime[Range[220]], PrimeQ[20#+1]&&PrimeQ[1#+20]&] %o A106066 (Magma) [p: p in PrimesUpTo(10000)| IsPrime(p+20) and IsPrime(20*p+1)] // _Vincenzo Librandi_, Nov 13 2010 %K A106066 nonn %O A106066 1,1 %A A106066 _Zak Seidov_, May 07 2005 %E A106066 More terms from _Vincenzo Librandi_, Apr 01 2010