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

Author

Reinhard Zumkeller, Jul 30 2007

Keywords

• nonn
• base

Comments

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

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

Examples

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

Links

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

Crossrefs

Cf. A131930, A131931.