A131929 Number of prime factors of n that are contained in decimal representation of n.

0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1

Offset

1,132

Comments

a(A050695(n)) = 0; a(A131930(n)) > 0;

a(A131931(n)) = n and a(m) <> n for m < A131931(n).

Links

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

Example

a(230) = a(23*5*2) = #{2,23} = 2.

Crossrefs

Cf. A131930, A131931.

Sequence in context: A353499 A359372 A327861 * A100821 A139689 A204175

Adjacent sequences: A131926 A131927 A131928 * A131930 A131931 A131932

Keyword

nonn,base

Author

Reinhard Zumkeller, Jul 30 2007

Status

approved