A350302 - OEIS

%I #24 Jan 22 2022 19:28:12

%S 16,28,27,29,34,47,55,62,65,73,80,127,70,121,136,181,117,130,153,153,

%T 160,161,176,181,184,187,189,198,208,221,235,193,252,190,233,220,247,

%U 220,254,257,259,277,279,289,263,319,261,331,260,297,316,280,304,313

%N 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 Triangle begins:

%e   16;

%e   28;

%e   27;

%e   29, 34;

%e   ;

%e   47, 55, 62, 65;

%e   73;

%e   80;

%e   ;

%e   ;

%e   127;

%e   70, 121, 136, 181;

%e   117, 130;

%e   153;

%e   153, 160;

%e   ...

%Y Cf. A007953, A350300, A350301.

%K nonn,base,tabf

%O 2,1

%A _Daniel Carter_, Dec 23 2021