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 A118103 #6 Feb 27 2019 08:48:55 %S A118103 1,1,2,4,6,9,12,15,18,22,26,30,34,38,42,47,52,57,62,67,72,77,82,87,93, %T A118103 99,105,111,117,123,129,135,141,147,153,159,166,173,180,187,194,201, %U A118103 208,215,222,229,236,243,250,257,264,272,280,288,296,304,312,320,328,336 %N A118103 First differences contain a(n) n's, in order, starting with a(0)=1. %C A118103 a(261) = 2701 = a(260) + 15 is the first case where a(n) is relatively prime to the difference (a(n)-a(n-1)) when that difference is composite; a(263) = 2731 is the first prime in the sequence with a composite difference. %H A118103 Charlie Neder, <a href="/A118103/b118103.txt">Table of n, a(n) for n = 0..1000</a> %Y A118103 Cf. A001462, A100143, A108104. %K A118103 nonn %O A118103 0,3 %A A118103 _Franklin T. Adams-Watters_, Apr 12 2006