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 A143535 #2 Mar 30 2012 17:25:32 %S A143535 0,1,1,1,1,1,1,1,0,0,1,1,1,1,1,2,2,1,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0, %T A143535 0,0,1,1,1,0,0,0,0,0,0,2,2,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,2,2, %U A143535 1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,1,1,1,1,1,0,0,0,0,0,0,0 %N A143535 Triangle read by rows, A122414 * A000012; 1<=k<=n. %C A143535 Row sums = A008472, the sum of distinct primes dividing n: (0, 2, 3, 2, 5, 5, 7, 2, 3, 7,...). Example: a(10) = 7 = 2 + 5. %F A143535 Triangle read by rows, A122414 * A000012; 1<=k<=n. By rows, partial sums of A122414 terms starting from the right. %e A143535 First few rows of the triangle = %e A143535 0; %e A143535 1, 1; %e A143535 1, 1, 1; %e A143535 1, 1, 0, 0; %e A143535 1, 1, 1, 1, 1; %e A143535 2, 2, 1, 0, 0, 0; %e A143535 1, 1, 1, 1, 1, 1, 1; %e A143535 1, 1, 0, 0, 0, 0, 0, 0; %e A143535 1, 1, 1, 0, 0, 0, 0, 0, 0; %e A143535 2, 2, 1, 1, 1, 0, 0, 0, 0, 0; %e A143535 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1; %e A143535 ... %e A143535 Example: row 6 = (2, 2, 1, 0, 0, 0) = partial sums starting from the right of row 6, A122414: (0, 1, 1, 0, 0, 0). %Y A143535 Cf. A122414, A008472. %K A143535 nonn,tabl %O A143535 1,16 %A A143535 _Gary W. Adamson_, Aug 23 2008