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 A280743 #16 Jan 14 2017 10:29:24 %S A280743 1,2,4,6,8,10,12,14,16,22,24,28,34,45,46,48,58,77,78,82,86,99,105,121, %T A280743 135,136,165,195,325,455,459,465,605,637,651,715,777,897,987,1001, %U A280743 1495,1573,2275,2387,2415,2421,2451,2493,2919,3129,3171,3633,3689,4011,4053,4137,4179,4879,4893 %N A280743 Records in A280864. %H A280743 Lars Blomberg, <a href="/A280743/b280743.txt">Table of n, a(n) for n = 1..1289</a> [First 226 terms from N. J. A. Sloane] %Y A280743 Cf. A280864, A280738, A280740, A280741, A280742, A280744. %K A280743 nonn %O A280743 1,2 %A A280743 _N. J. A. Sloane_, Jan 12 2017