A007471 Sum of digits of n a(n) is n ( = A003634/n), or 0 if no such number exists.

1, 9, 9, 3, 9, 9, 3, 9, 9, 1, 18, 9, 9, 9, 9, 9, 9, 9, 6, 9, 18, 6, 9, 9, 6, 9, 9, 4, 9, 9, 12, 18, 18, 3, 9, 9, 3, 9, 9, 3, 18, 18, 12, 18, 9, 5, 9, 9, 9, 9, 18, 6, 18, 18, 2, 9, 9, 9, 9, 9, 12, 0, 0, 5, 0, 18, 3, 9, 9, 3, 18, 18, 7, 27, 0, 12, 18

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• base

References

• J. H. Conway, personal communication.
• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Extensions

Zeros inserted for consistency with A003634 by Sean A. Irvine, Jan 04 2018