A112781 Number of highly composite numbers (definition 1, A002182) < 10^n.
4, 9, 15, 20, 29, 38, 47, 56, 66, 76, 86, 95, 106, 117, 125, 135, 146, 156, 167, 177, 186, 196, 209, 219, 231, 241, 254, 267, 280, 292, 305, 316, 330, 343, 356, 368, 381, 396, 409, 423, 436, 450, 463, 476, 491, 503, 517, 530, 547, 561, 577, 593, 608, 625, 640
Offset: 1
Keywords
Examples
a(1) = 4 since there are four highly composite numbers < 10^1 {1,2,4,6}.
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
Partial sums of A112780. - Lekraj Beedassy, Sep 02 2006