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 A177981 #2 Mar 30 2012 18:51:06 %S A177981 23,31,53,67,113,131,173,191,223,229,311,337,419,431,479,653,659,661, %T A177981 673,719,733,797,839,1289,1297,5101,7103,10709,10903,11113,11273, %U A177981 11311,13709,13901,14149,15101,15727,16301,16703,17317,17903,18119,18191 %N A177981 a(n) = prime number > a(n-1) that contains the n-th prime as a substring. %e A177981 .. prime(n): 2_ 3_ 5_ _7 11_ 13_ 17_ 19_ _23 _29 31_ _37 %e A177981 ...... a(n): 23 31 53 67 113 131 173 191 223 229 311 337 . %Y A177981 Cf. A144565, A169798, A177982. %K A177981 base,nonn %O A177981 1,1 %A A177981 _Reinhard Zumkeller_, May 16 2010