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 A127573 #11 Sep 18 2022 19:11:44 %S A127573 1,1,6,1,0,12,1,6,0,28,1,0,0,0,30,1,6,12,0,0,72,1,0,0,0,0,0,56,1,6,0, %T A127573 28,0,0,0,120,1,0,12,0,0,0,0,0,117,1,6,0,0,30,0,0,0,0,180,1,0,0,0,0,0, %U A127573 0,0,0,0,132,1,6,12,28,0,72,0,0,0,0,0,336 %N A127573 Triangle T(n, k) = k*sigma(k) if k divides n, else 0. %C A127573 Right border = n*sigma(n), A064987; row sums = A001001. %e A127573 First few rows of the triangle: %e A127573 1; %e A127573 1, 6; %e A127573 1, 0, 12; %e A127573 1, 6, 0, 28; %e A127573 1, 0, 0, 0, 30; %e A127573 ... %Y A127573 Cf. A064987, A127093, A001001, A000203, A127574. %K A127573 nonn,tabl %O A127573 1,3 %A A127573 _Gary W. Adamson_, Jan 19 2007 %E A127573 Corrected, extended and edited by _Andrey Zabolotskiy_, Sep 18 2022