A073893 a(10k) = 0 and if n is not a multiple of 10 then a(n) is the smallest positive integer such that the concatenation of the first n terms is a multiple of n.

1, 2, 3, 2, 5, 2, 5, 6, 1, 0, 8, 4, 9, 4, 5, 6, 25, 2, 15, 0, 15, 10, 28, 16, 25, 16, 28, 16, 13, 0, 14, 4, 22, 36, 5, 16, 35, 14, 47, 0, 16, 8, 42, 28, 35, 18, 49, 44, 27, 0, 42, 4, 26, 6, 45, 52, 53, 38, 62, 0, 44, 50, 25, 28, 15, 32, 43, 72, 29, 0, 61, 44, 45, 8, 25, 56, 82, 84, 85, 0

Offset: 1

Author

Amarnath Murthy, Aug 17 2002

Keywords

• base
• nonn
• easy

Comments

Note that the concatenation of the first 10k terms is not necessarily a multiple of 10k.

Crossrefs

Cf. A051883, A073894, A099552.

Extensions

Edited and extended by David Wasserman, Oct 21 2004