A221532 The number of n-digit numbers whose last k digits are divisible by k for k = 1..n.

10, 45, 150, 756, 1530, 5100, 7301, 38646, 42940, 430263, 391149

Offset

1,1

Links

Table of n, a(n) for n=1..11.

Example

There are ten one-digit numbers divisible by 1 so a(1)=10.
For two-digit numbers, the ones digit must be such that the two-digit number is divisible by 2 which gives 45 numbers, that is, all even numbers from 10 to 98 to satisfy the requirement. So a(2)=45.

Crossrefs

Cf. A164836.

Sequence in context: A005714 A175705 A143671 * A241432 A317020 A141499

Adjacent sequences: A221529 A221530 A221531 * A221533 A221534 A221535

Keyword

nonn,base

Author

Shyam Sunder Gupta, Aug 07 2013

Status

approved