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 A090980 #4 Dec 05 2013 19:56:45 %S A090980 2,5,8,15,17,35,27,47,50,73,64,103,87,131,134,163,148,217,180,251,248, %T A090980 293,264,359,318,399,386,461,420,569,474,585,580,657,636,761,676,813, %U A090980 796,911,832,1039,910,1083,1072,1171,1090,1313,1194,1399,1334,1489,1384 %N A090980 From the set of numbers > 1, go on deleting n smallest numbers relatively prime to n that were not deleted earlier; a(n) = the largest number deleted. %Y A090980 Cf. A090979. %Y A090980 Cf. A081964. %K A090980 nonn,easy %O A090980 1,1 %A A090980 _Amarnath Murthy_, Jan 23 2004 %E A090980 More terms from _David Wasserman_, Feb 23 2006