login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A112781 Number of highly composite numbers (definition 1, A002182) < 10^n. 7
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 (list; graph; refs; listen; history; text; internal format)
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

Partial sums of A112780. - Lekraj Beedassy, Sep 02 2006

EXAMPLE

a(1) = 4 since there are four highly composite numbers < 10^1 {1,2,4,6}.

CROSSREFS

Cf. A002182, A002183, A108602, A112778, A112779, A112780.

Sequence in context: A313272 A301680 A281590 * A166131 A313273 A313274

Adjacent sequences:  A112778 A112779 A112780 * A112782 A112783 A112784

KEYWORD

nonn

AUTHOR

Ray Chandler, Nov 11 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 18 09:46 EST 2019. Contains 329261 sequences. (Running on oeis4.)