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 A350301 #23 Jan 22 2022 19:27:10 %S A350301 13,19,18,23,31,38,44,46,56,64,35,109,52,112,118,127,97,108,144,88, %T A350301 144,139,152,153,154,173,178,189,172,199,203,187,234,127,188,148,238, %U A350301 115,229,238,239,245,234,244,245,283,252,283,161,271,288,163,259,295,316 %N A350301 Irregular triangle read by rows: The n-th row lists the smaller number in each "n-th power friendship", that is, numbers k such that digsum(digsum(k^n)^n) = k and digsum(k^n) > k. %e A350301 Triangle begins: %e A350301 13; %e A350301 19; %e A350301 18; %e A350301 23, 31; %e A350301 ; %e A350301 38, 44, 46, 56; %e A350301 64; %e A350301 35; %e A350301 ; %e A350301 ; %e A350301 109; %e A350301 52, 112, 118, 127; %e A350301 97, 108; %e A350301 144; %e A350301 88, 144; %e A350301 ... %Y A350301 Cf. A007953, A350300, A350302. %K A350301 nonn,base,tabf %O A350301 2,1 %A A350301 _Daniel Carter_, Dec 23 2021