A036227 a(1) = 20; a(n+1) = a(n) + sum of decimal digits of a(n).

20, 22, 26, 34, 41, 46, 56, 67, 80, 88, 104, 109, 119, 130, 134, 142, 149, 163, 173, 184, 197, 214, 221, 226, 236, 247, 260, 268, 284, 298, 317, 328, 341, 349, 365, 379, 398, 418, 431, 439, 455, 469, 488, 508, 521, 529, 545, 559, 578, 598, 620, 628, 644, 658

Offset: 1

Author

Miklos SZABO (mike(AT)ludens.elte.hu)

Keywords

• easy
• nonn
• base

Comments

elements >= 109 can be found in A007618.

Links

• Index entries for Colombian or self numbers and related sequences

Crossrefs

Cf. A004207, A016052, A007618, A006507, A016052.

Programs

Mathematica

NestList[#+Total[IntegerDigits[#]]&,20,60] (* Harvey P. Dale, May 11 2014 *)

Extensions

Edited by Charles R Greathouse IV, Aug 02 2010