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 A081998 #10 Aug 31 2018 16:49:22 %S A081998 1,2,3,4,5,7,9,11,13,17,19,21,23,26,29,31,37,41,43,47,49,53,59,60,61, %T A081998 63,67,71,73,79,83,88,89,97,101,103,107,109,113,115,127,131,137,139, %U A081998 143,149,151,155,157,161,163,167,169,173,179,181,187,191,193,197,198,199 %N A081998 Square array read by antidiagonals, alternating upwards and downwards: T(i, j) is the least number that is greater than the previous term and coprime to every number on the same row or column. %C A081998 Is the sequence related to A067126? This should exhibit some number-theoretic properties. %H A081998 Charlie Neder, <a href="/A081998/b081998.txt">Table of n, a(n) for n = 0..10010</a> %e A081998 Array begins: %e A081998 1, 2, 7, 9, ... %e A081998 3, 5, 11, ... %e A081998 4, 13, ... %e A081998 17, ... %e A081998 ... %Y A081998 Cf. A081999, A082000, A082001. %K A081998 nonn,tabl %O A081998 0,2 %A A081998 _Amarnath Murthy_, Apr 05 2003 %E A081998 More terms from _David Wasserman_, Jul 28 2004