A165957 Product of the digits of the n-th nonprime.

1, 4, 6, 8, 9, 0, 2, 4, 5, 6, 8, 0, 2, 4, 8, 10, 12, 14, 16, 0, 6, 9, 12, 15, 18, 24, 27, 0, 8, 16, 20, 24, 32, 36, 0, 5, 10, 20, 25, 30, 35, 40, 0, 12, 18, 24, 30, 36, 48, 54, 0, 14, 28, 35, 42, 49, 56, 0, 8, 16, 32, 40, 48, 56, 64, 0, 9, 18, 27, 36, 45, 54, 72, 81, 0, 0, 0, 0, 0, 0, 0, 1, 2

Offset: 1

Author

Juri-Stepan Gerasimov, Oct 01 2009

Keywords

• nonn
• base
• less

Crossrefs

Cf. A018252, A053666.

Formula

a(n) = A007954(A018252(n)).

Extensions

Entries checked, keyword:base added by R. J. Mathar, Oct 05 2009