A288738 Number of ways writing the n-th 7-smooth number as a product of decimal digits of some other number which has no digits equal to 1.

1, 1, 1, 2, 1, 2, 1, 3, 2, 1, 3, 1, 1, 4, 3, 2, 1, 5, 1, 2, 2, 2, 5, 1, 6, 3, 2, 2, 7, 1, 1, 4, 3, 3, 2, 7, 1, 9, 1, 4, 3, 3, 3, 9, 1, 2, 1, 7, 4, 5, 1, 3, 8, 2, 2, 13, 1, 2, 5, 5, 5, 1, 6, 2, 12, 2, 3, 2, 12, 5, 2, 7, 3, 1, 1, 6, 10, 4, 3, 17, 2, 3, 2, 7, 10, 7

Offset

1,4

Comments

This sequence is A067734 without the zeros.

Links

David A. Corneth, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A002473, A007602, A067734.

Sequence in context: A231719 A123400 A232502 * A214651 A196059 A272900

Adjacent sequences: A288735 A288736 A288737 * A288739 A288740 A288741

Keyword

nonn,base

Author

David A. Corneth, Jun 22 2017

Status

approved