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 A278493 #7 Nov 24 2016 09:27:54 %S A278493 1,1,2,1,3,3,1,3,5,4,1,3,7,7,5,1,3,7,9,9,6,1,3,7,13,13,11,7,1,3,7,13, %T A278493 15,15,13,8,1,3,7,13,19,19,19,15,9,1,3,7,13,19,25,25,21,17,10,1,3,7, %U A278493 13,19,27,27,27,25,19,11,1,3,7,13,19,27,31,31,31,27,21,12,1,3,7,13,19,27,39,39,39,37,31,23,13 %N A278493 Transpose of square array A278492. %C A278493 See A278492. %H A278493 Antti Karttunen, <a href="/A278493/b278493.txt">Table of n, a(n) for n = 0..7259; the first 120 antidiagonals of the array</a> %H A278493 <a href="/index/Si#sieve">Index entries for sequences generated by sieves</a> %o A278493 (Scheme) (define (A278493 n) (A278492bi (A025581 n) (A002262 n))) ;; Code for A278492bi given in A278492. %Y A278493 Transpose: A278492. %K A278493 nonn,tabl %O A278493 0,3 %A A278493 _Antti Karttunen_, Nov 23 2016