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A175084 Possible values for product of perfect divisors of n. 4
1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Perfect divisor of n is divisor d such that d^k = n for some k >= 1. All terms of this sequence occur only once. See A089723 (number of perfect divisors of n) and A175068 (product of perfect divisors of n).

Complement of A175085. - Jaroslav Krizek, Jan 30 2010

LINKS

Table of n, a(n) for n=1..72.

MATHEMATICA

With[{nn = 78}, TakeWhile[#, # <= nn &] &@ Union@ Table[Apply[Times, Select[Divisors@ n, Or[# == 1, #^IntegerExponent[n, #] == n] &]], {n, nn}] ] (* Michael De Vlieger, Nov 21 2017 *)

CROSSREFS

Cf. A175087 (characteristic function).

Sequence in context: A031975 A028729 A213367 * A171519 A072099 A046841

Adjacent sequences:  A175081 A175082 A175083 * A175085 A175086 A175087

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Jan 24 2010

STATUS

approved

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Last modified February 19 03:37 EST 2018. Contains 299330 sequences. (Running on oeis4.)