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.

13, 19, 18, 23, 31, 38, 44, 46, 56, 64, 35, 109, 52, 112, 118, 127, 97, 108, 144, 88, 144, 139, 152, 153, 154, 173, 178, 189, 172, 199, 203, 187, 234, 127, 188, 148, 238, 115, 229, 238, 239, 245, 234, 244, 245, 283, 252, 283, 161, 271, 288, 163, 259, 295, 316

Offset

2,1

Links

Table of n, a(n) for n=2..56.

Example

Triangle begins:
  13;
  19;
  18;
  23, 31;
  ;
  38, 44, 46, 56;
  64;
  35;
  ;
  ;
  109;
  52, 112, 118, 127;
  97, 108;
  144;
  88, 144;
  ...

Crossrefs

Cf. A007953, A350300, A350302.

Sequence in context: A372763 A236999 A216639 * A171098 A349762 A118845

Adjacent sequences: A350298 A350299 A350300 * A350302 A350303 A350304

Keyword

nonn,base,tabf

Author

Daniel Carter, Dec 23 2021

Status

approved