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.

16, 28, 27, 29, 34, 47, 55, 62, 65, 73, 80, 127, 70, 121, 136, 181, 117, 130, 153, 153, 160, 161, 176, 181, 184, 187, 189, 198, 208, 221, 235, 193, 252, 190, 233, 220, 247, 220, 254, 257, 259, 277, 279, 289, 263, 319, 261, 331, 260, 297, 316, 280, 304, 313

Offset

2,1

Links

Table of n, a(n) for n=2..55.

Example

Triangle begins:
  16;
  28;
  27;
  29, 34;
  ;
  47, 55, 62, 65;
  73;
  80;
  ;
  ;
  127;
  70, 121, 136, 181;
  117, 130;
  153;
  153, 160;
  ...

Crossrefs

Cf. A007953, A350300, A350301.

Sequence in context: A302553 A300132 A101857 * A184039 A212051 A166595

Adjacent sequences: A350299 A350300 A350301 * A350303 A350304 A350305

Keyword

nonn,base,tabf

Author

Daniel Carter, Dec 23 2021

Status

approved