A121042 - OEIS

A121042

Smallest divisor of n that is also contained in the decimal representation of n.

1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 23, 2, 5, 2, 27, 2, 29, 3, 1, 2, 3, 34, 5, 3, 37, 38, 3, 4, 1, 2, 43, 4, 5, 46, 47, 4, 49, 5, 1, 2, 53, 54, 5, 56, 57, 58, 59, 6, 1, 2, 3, 4, 5, 6, 67, 68, 69, 7, 1, 2, 73, 74, 5, 76, 7, 78, 79, 8, 1, 2, 83, 4, 5, 86, 87, 8, 89, 9, 1

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OFFSET

1,2

COMMENTS

1 <= a(n) <= n;

a(A011531(n)) = 1; a(n) = n iff A121041(n) = 1.

a(n) = 1 for almost all n (measure 1). - Charles R Greathouse IV, Mar 31 2016

LINKS

Table of n, a(n) for n=1..91.

EXAMPLE

a(48) = Min{4, 8, 48} = 4;

a(49) = Min{49} = 49;