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A007624 Product of proper divisors of n = n^k, k>1.
(Formerly M4824)
+0
4
12, 18, 20, 24, 28, 30, 32, 40, 42, 44, 45, 48, 50, 52, 54, 56, 60, 63, 66, 68, 70, 72, 75, 76, 78, 80, 84, 88, 90, 92, 96, 98, 99, 102, 104, 105, 108, 110, 112, 114, 116, 117, 120, 124, 126, 128, 130, 132, 135, 136, 138, 140, 147, 148, 150, 152, 153, 154 (list; graph; listen)
OFFSET

1,1

REFERENCES

A. H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 1964, p. 23.

FORMULA

d(n) >= 4 and even.

CROSSREFS

Sequence in context: A077294 A025491 A091196 this_sequence A036456 A102467 A126706

Adjacent sequences: A007621 A007622 A007623 this_sequence A007625 A007626 A007627

KEYWORD

nonn

AUTHOR

njas, Robert G. Wilson v (rgwv(AT)rgwv.com), Mira Bernstein (mira(AT)math.berkeley.edu)

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.


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