A036233 Inverse Colombian function.

1, 1, 3, 1, 5, 3, 7, 1, 9, 5, 5, 3, 5, 7, 3, 1, 5, 9, 7, 20, 3, 20, 1, 3, 5, 20, 9, 1, 7, 3, 31, 5, 3, 20, 31, 9, 5, 1, 3, 7, 20, 42, 31, 7, 9, 20, 5, 42, 1, 31, 3, 7, 53, 9, 31, 20, 3, 5, 7, 42, 53, 1, 9, 64, 31, 42, 20, 53, 3, 1, 5, 9, 7, 64, 75, 31, 1, 42, 5, 20, 9, 53, 7, 3, 64, 86, 75, 20

Offset: 1

Author

Miklos SZABO (mike(AT)ludens.elte.hu)

Keywords

• easy
• nonn
• base

Comments

a(n) is the smallest x with n in the digit summing sequence starting with x.

Contains only self-numbers, see A003052.

Links

• Sean A. Irvine, Table of n, a(n) for n = 1..10000
• Sean A. Irvine, Java program (github)

Crossrefs

Cf. A004207, A016052, A007618, A006507, A016052.