A180477 Numbers n such that r*n/k is an integer. n=(x_1 x_2 ... x_r) where x_i are digits of n, k = x_1 + x_2 + ... + x_r.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 18, 20, 21, 22, 24, 27, 30, 33, 36, 40, 42, 44, 45, 48, 50, 51, 54, 55, 60, 63, 66, 70, 72, 77, 80, 81, 84, 88, 90, 99, 100, 102, 108, 110, 111, 112, 114, 117, 120, 126, 132

Offset

1,2

Comments

A005349 is a subsequence of this sequence.

n * A055642(a(n)) mod A007953(a(n)) = 0. - Reinhard Zumkeller, Oct 27 2015

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Example

n=126, r=3, 3*126/(1+2+6)=42, so 126 belongs to this sequence.

Prog

(Haskell)
a180477 n = a180477_list !! (n-1)
a180477_list = filter (\x -> mod (x * a055642 x) (a007953 x) == 0) [1..]
-- Reinhard Zumkeller, Oct 27 2015

Crossrefs

Cf. A005349.

Cf. A007953, A055642, subsequence of A263808.

Sequence in context: A238368 A342164 A263808 * A271239 A083970 A246088

Adjacent sequences: A180474 A180475 A180476 * A180478 A180479 A180480

Keyword

base,easy,nonn

Author

Ctibor O. Zizka, Sep 07 2010

Status

approved