A230099 a(n) = n + (product of digits of n).

0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 50, 56, 62, 68, 74, 80, 86, 92, 98, 104, 60, 67, 74, 81, 88, 95, 102, 109, 116, 123, 70, 78, 86, 94, 102, 110, 118, 126

Offset

0,2

Comments

A230099, A063114, A098736, A230101 are analogs of A092391 and A062028.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Index entries for Colombian or self numbers and related sequences

Formula

a(n) = n iff n contains a digit 0 (A011540). - Bernard Schott, Jul 31 2023

Maple

with transforms; [seq(n+digprod(n), n=0..200)];

Prog

(Haskell)
a230099 n = a007954 n + n  -- Reinhard Zumkeller, Oct 13 2013
(PARI) a(n) = if (n, n + vecprod(digits(n)), 0); \\ Michel Marcus, Dec 18 2018
(Python)
from math import prod
def a(n): return n + prod(map(int, str(n)))
print([a(n) for n in range(78)]) # Michael S. Branicky, Jan 09 2023

Crossrefs

Cf. A007954, A011540, A092391, A062028, A004207, A230093, A003052, A176995.

Cf. also A063114, A098736, A230101, A230103, A230104, A230105, A062028, A230102, A063108.

Sequence in context: A169805 A340479 A263042 * A098727 A182324 A095815

Adjacent sequences: A230096 A230097 A230098 * A230100 A230101 A230102

Keyword

nonn,base,look

Author

N. J. A. Sloane, Oct 12 2013

Status

approved