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A140645
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Digit sums of highly composite numbers.
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2
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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)
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OFFSET
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1,2
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COMMENTS
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Except for the first three terms, all others are multiples of 3.
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LINKS
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Amiram Eldar, Table of n, a(n) for n = 1..10000
A. Flammenkamp, Table of 1200 Highly Composite Numbers.
Graeme McRae, Highly Composite Numbers.
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FORMULA
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a(n) = A007953(A002182(n)). - Amiram Eldar, Nov 13 2019
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EXAMPLE
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2162160 is a highly composite number whose digit sum is 18.
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CROSSREFS
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Cf. A002182, A002183, A007953, A117825, A127390.
Sequence in context: A088178 A259840 A161184 * A327724 A117532 A287662
Adjacent sequences: A140642 A140643 A140644 * A140646 A140647 A140648
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi, Jul 08 2008
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STATUS
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approved
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