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 A130069 #6 Feb 20 2022 01:41:43 %S A130069 2,3,2,5,0,2,7,3,0,2,11,0,0,0,2,13,5,3,0,0,2,17,0,0,0,0,0,2,19,7,0,3, %T A130069 0,0,0,23,0,5,0,0,0,0,0,2,29,11,0,0,3,0,0,0,0,2 %N A130069 Primes by columns, interspersed with (k-1) zeros. %C A130069 Left column = the primes, A000040; row sums = A007445, (2, 5, 7, 12, 13, 23, ...), the inverse Moebius transform of the primes. A130070 = A130069 with nonzero terms reversed and mapped on A051731. %F A130069 Primes by columns, interspersed with (k-1) zeros. Map the primes on the "1" terms of A051731, by columns; and rest zeros. %e A130069 First few rows of the triangle: %e A130069 2; %e A130069 3, 2; %e A130069 5, 0, 2; %e A130069 7, 3, 0, 2; %e A130069 11, 0, 0, 0, 2; %e A130069 13, 5, 3, 0, 0, 2; %e A130069 17, 0, 0, 0, 0, 0, 2; %e A130069 19, 7, 0, 3, 0, 0, 0, 2; %e A130069 23, 0, 5, 0, 0, 0, 0, 0, 2; %e A130069 29, 11, 0, 0, 3, 0, 0, 0, 0, 2; %e A130069 ... %Y A130069 Cf. A000040, A051731, A130070. %K A130069 nonn,tabl %O A130069 1,1 %A A130069 _Gary W. Adamson_, May 05 2007