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A046754 Square of d(n) (number of divisors) divides n. 6
1, 9, 128, 625, 972, 1152, 2000, 2025, 5625, 6561, 7776, 8100, 10000, 10800, 18000, 21952, 26244, 30000, 32768, 35721, 50625, 55296, 56700, 64000, 64800, 65856, 70000, 80000, 84672, 89100, 90000, 97200, 98304, 99225, 105300, 109760, 110000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Subset of A033950.

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..1000

EXAMPLE

If n=972, d(n)=Sigma[ 0,n ]=18. Its square is 324 which divides 972.

MATHEMATICA

Select[Range[110000], IntegerQ[#/DivisorSigma[0, #]^2] &] (* Jayanta Basu, Jun 28 2013 *)

CROSSREFS

Cf. A033950, A046755, A046756.

Sequence in context: A092651 A258294 A073014 * A203425 A275259 A064746

Adjacent sequences:  A046751 A046752 A046753 * A046755 A046756 A046757

KEYWORD

nonn

AUTHOR

Labos Elemer

STATUS

approved

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Last modified March 19 13:29 EDT 2019. Contains 321330 sequences. (Running on oeis4.)