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 A046754 Numbers k such that the square of d(k) (number of divisors) divides k. 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 Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Donovan Johnson) EXAMPLE If k = 972, d(k) = sigma(0,k) = 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 STATUS approved

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Last modified September 27 22:36 EDT 2020. Contains 337388 sequences. (Running on oeis4.)