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A140645 Digit sums of highly composite numbers. 2
1, 2, 4, 6, 3, 6, 9, 12, 6, 3, 9, 6, 9, 9, 12, 9, 15, 9, 9, 18, 9, 9, 9, 9, 18, 18, 9, 18, 18, 18, 18, 18, 18, 18, 36, 18, 27, 18, 18, 18, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Except for the first three terms, all others are multiples of 3.

LINKS

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

A. Flammenkamp, Table of 1200 Highly Composite Numbers.

Graeme McRae, Highly Composite Numbers.

FORMULA

a(n) = A007953(A002182(n)). - Amiram Eldar, Nov 13 2019

EXAMPLE

2162160 is a highly composite number whose digit sum is 18.

CROSSREFS

Cf. A002182, A002183, A007953, A117825, A127390.

Sequence in context: A088178 A259840 A161184 * A327724 A117532 A287662

Adjacent sequences:  A140642 A140643 A140644 * A140646 A140647 A140648

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Jul 08 2008

STATUS

approved

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Last modified January 17 06:24 EST 2021. Contains 340214 sequences. (Running on oeis4.)