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 A230559 #21 Jan 29 2014 01:05:04 %S A230559 634038307449,4846359321105,11927878640385,20835183400305, %T A230559 34166605315305,54096163177785,63154533545265,88365393281985, %U A230559 189080281720065,850943773070385,917252751841665,1278728202166185,1602254869802049,3742704749436465,6082185264252945 %N A230559 Pseudoprimes n to base 2 such that n-2, n+2 and n+4 are primes. %C A230559 All numbers in this sequence end in either 5 or 9. %H A230559 Shyam Sunder Gupta, <a href="/A230559/b230559.txt">Table of n, a(n) for n = 1..82</a> %e A230559 634038307449 is a pseudoprime (base 2) and 634038307447, 634038307451 and 634038307453 are primes. %Y A230559 Cf. A001567, A057942, A230488, A230489, A228575. %K A230559 nonn %O A230559 1,1 %A A230559 _Shyam Sunder Gupta_, Oct 27 2013