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 A090471 #5 Dec 05 2013 19:56:37 %S A090471 3,5,11,19,31,37,59,43,41,79,53,61,67,71,107,101,127,97,181,131,157, %T A090471 167,313,113,197,179,211,163,283,173,251,227,269,241,359,223,379,239, %U A090471 401,293,1163,307,277,281,467,337,587,271,521,479,641,499,347,683,367,431 %N A090471 Smallest prime not already used that is of the form prime(n)+kn for some k > 0. %Y A090471 Cf. A072063. %K A090471 nonn %O A090471 1,1 %A A090471 _Amarnath Murthy_, Dec 02 2003 %E A090471 More terms from _David Wasserman_, Nov 08 2005