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A072824 Sum of aliquot divisors of Ramanujan's highly composite numbers. 1
0, 1, 3, 6, 16, 36, 55, 76, 108, 240, 366, 504, 810, 1698, 2040, 3108, 4272, 6840, 14304, 21240, 29232, 44400, 59088, 74744, 84600, 134688, 152712, 176688, 262440, 360864, 547920, 729216, 922128, 1118880, 1661616, 1882944, 2260800, 2529072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

FORMULA

a(n) = A001065(A002182(n)). - Amiram Eldar, Aug 05 2019

EXAMPLE

a(3) = 3 because sum of aliquot divisors of 3rd highly composite number i.e. 4 is 1 + 2 = 3.

MATHEMATICA

aliq[n_] := DivisorSigma[1, n] - n; s = {}; dm = 0; Do[d = DivisorSigma[0, n]; If[d > dm, dm = d; AppendTo[s, aliq[n]]], {n, 1, 1000}]; s (* Amiram Eldar, Aug 05 2019 *)

CROSSREFS

Cf. A001065, A002182.

Sequence in context: A319752 A130095 A293993 * A089406 A027852 A203068

Adjacent sequences:  A072821 A072822 A072823 * A072825 A072826 A072827

KEYWORD

nonn

AUTHOR

Shyam Sunder Gupta, Jul 21 2002

STATUS

approved

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Last modified June 14 17:31 EDT 2021. Contains 345037 sequences. (Running on oeis4.)