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A065300 Numbers n such that sum of divisors is a square-free number. +0
5
1, 2, 4, 5, 8, 9, 13, 16, 18, 20, 25, 26, 29, 36, 37, 41, 45, 49, 50, 61, 64, 72, 73, 74, 80, 100, 101, 104, 109, 113, 116, 117, 121, 122, 128, 137, 144, 146, 148, 157, 169, 173, 180, 181, 193, 196, 200, 208, 218, 225, 229, 234, 242, 244, 256, 257, 261, 277, 281 (list; graph; listen)
OFFSET

1,2

FORMULA

Solutions to Abs[mu[Sigma[x]]]=1

EXAMPLE

m=100, sigma[100]=7.31

CROSSREFS

A000203, A008683, A065299.

Sequence in context: A102821 A101881 A064573 this_sequence A080403 A092739 A101394

Adjacent sequences: A065297 A065298 A065299 this_sequence A065301 A065302 A065303

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Oct 29 2001

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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