A112780 Number of highly composite numbers (definition 1, A002182) with n decimal digits.

4, 5, 6, 5, 9, 9, 9, 9, 10, 10, 10, 9, 11, 11, 8, 10, 11, 10, 11, 10, 9, 10, 13, 10, 12, 10, 13, 13, 13, 12, 13, 11, 14, 13, 13, 12, 13, 15, 13, 14, 13, 14, 13, 13, 15, 12, 14, 13, 17, 14, 16, 16, 15, 17, 15, 19, 15, 18, 15, 16, 17, 16, 17, 16, 15, 19, 15, 19, 14, 18, 14, 19, 17

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Highly Composite Number

A. Flammenkamp, First 1200 highly composite numbers

Formula

First differences of A112781. - Amiram Eldar, Jul 02 2019

Example

a(1) = 4 since there are four highly composite numbers with one decimal digit {1,2,4,6}.

Crossrefs

Cf. A002182, A002183, A108602, A112778, A112779, A112781.

Sequence in context: A136004 A248864 A134299 * A021223 A206291 A058979

Adjacent sequences: A112777 A112778 A112779 * A112781 A112782 A112783

Keyword

nonn,look,base

Author

Ray Chandler, Nov 11 2005

Status

approved