A033662 Possible digital sums of Smith numbers (conjectural).

4, 9, 13, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82

Offset: 1

Author

David W. Wilson

Keywords

• base
• nonn

Comments

Numbers not in sequence are not digital sums of Smith numbers. Numbers in sequence are almost certainly so.

Crossrefs

Cf. A006753.

Formula

a(n) in {4, 9, 13, 15} or a(n) >= 17