cp's OEIS Frontend

A350302 Irregular triangle read by rows: The n-th row lists the larger number in each "n-th power friendship", that is, numbers k such that digsum(digsum(k^n)^n) = k and digsum(k^n) < k.

%I A350302 #24 Jan 22 2022 19:28:12
%S A350302 16,28,27,29,34,47,55,62,65,73,80,127,70,121,136,181,117,130,153,153,
%T A350302 160,161,176,181,184,187,189,198,208,221,235,193,252,190,233,220,247,
%U A350302 220,254,257,259,277,279,289,263,319,261,331,260,297,316,280,304,313
%N A350302 Irregular triangle read by rows: The n-th row lists the larger 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 A350302 Triangle begins:
%e A350302   16;
%e A350302   28;
%e A350302   27;
%e A350302   29, 34;
%e A350302   ;
%e A350302   47, 55, 62, 65;
%e A350302   73;
%e A350302   80;
%e A350302   ;
%e A350302   ;
%e A350302   127;
%e A350302   70, 121, 136, 181;
%e A350302   117, 130;
%e A350302   153;
%e A350302   153, 160;
%e A350302   ...
%Y A350302 Cf. A007953, A350300, A350301.
%K A350302 nonn,base,tabf
%O A350302 2,1
%A A350302 _Daniel Carter_, Dec 23 2021