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 A023560 #8 Jun 07 2019 07:48:05 %S A023560 0,4,6,8,13,16,20,23,29,34,40,44,47,56,64,69,73,79,85,95,102,109,116, %T A023560 123,129,136,147,155,165,173,179,188,200,206,216,227,237,247,255,265, %U A023560 275,283,291,305,318,329,339,349,359,370,381,391,402,417,430 %N A023560 Convolution of A023531 and composite numbers (A002808). %Y A023560 Cf. A002808, A023531. %K A023560 nonn %O A023560 1,2 %A A023560 _Clark Kimberling_ %E A023560 Missing a(49)=359 inserted by _Sean A. Irvine_, Jun 06 2019