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 A243529 #14 May 06 2015 03:57:30 %S A243529 127,1123,1129,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279, %T A243529 1283,1289,1291,1297,2129,3121,4127,4129,6121,7121,7127,7129,8123, %U A243529 9127,11213,11239,11243,11251,11257,11261,11273,11279,11287 %N A243529 Prime numbers containing the string 12. %C A243529 Subsequence of A208272. [_Bruno Berselli_, May 06 2015] %H A243529 Vincenzo Librandi, <a href="/A243529/b243529.txt">Table of n, a(n) for n = 1..1000</a> %F A243529 a(n) ~ n log n. - _Charles R Greathouse IV_, Jun 20 2014 %t A243529 Select[Prime[Range[2000]], ! StringFreeQ[ToString[#], "12" ] &] %o A243529 (PARI) contains(n,k)=my(N=digits(n),K=digits(k)); for(i=0,#N-#K, for(j=1,#K,if(N[i+j]!=K[j],next(2))); return(1)); 0 %o A243529 is(n)=isprime(n) && contains(n,12) \\ _Charles R Greathouse IV_, Jun 20 2014 %Y A243529 Cf. similar sequences listed in A257667. %K A243529 nonn,base,less %O A243529 1,1 %A A243529 _Vincenzo Librandi_, Jun 06 2014