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 A226840 #4 Jun 19 2013 10:42:16 %S A226840 3,2,9547,255763,9148351,189637381,78793186597,1312901933341 %N A226840 Least prime in a string of exactly n consecutive primes all differing by a square. %C A226840 a(9) > 10^14. %e A226840 The 7 gaps following a(8) = 1312901933341 are the squares 36, 144, 36, 36, 4, 36, 36. %Y A226840 Cf. A220697, A226768, A226769. %K A226840 nonn %O A226840 1,1 %A A226840 _Giovanni Resta_, Jun 19 2013