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 A104802 #5 Dec 15 2014 17:46:35 %S A104802 23,53,73,223,233,283,337,379,521,571,599,643,811,821,857,881,991, %T A104802 1093,1103,1163,1229,1231,1399,1439,1481,1511,1583,1613,1663,1723, %U A104802 1747,1753,1823,1831,1999,2017,2281,2293,2351,2467,2543,2621,2659,2719,2741,2837 %N A104802 Primes p such that the string p0123456789 is prime, or primes in A104801. %t A104802 Select[Prime[Range[500]],PrimeQ[#*10^10+123456789]&] (* _Harvey P. Dale_, Dec 15 2014 *) %Y A104802 Cf. A104799, A104801. %K A104802 nonn,base %O A104802 1,1 %A A104802 _Zak Seidov_, Mar 29 2005