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A086368 n is not square-free but sigma[n] is square-free. +0
1
4, 8, 9, 16, 18, 20, 25, 36, 45, 49, 50, 64, 72, 80, 100, 104, 116, 117, 121, 128, 144, 148, 169, 180, 196, 200, 208, 225, 234, 242, 244, 256, 261, 289, 292, 296, 320, 325, 333, 361, 369, 404, 436, 441, 450, 452, 464, 488, 512, 529, 548, 549, 576, 578, 584, 592 (list; graph; listen)
OFFSET

1,1

EXAMPLE

n=45=3.3.5 and sigma[45]=78=2.3.13

CROSSREFS

Cf. A065303, A087249, A065301.

Sequence in context: A106840 A140612 A034023 this_sequence A034024 A140269 A070003

Adjacent sequences: A086365 A086366 A086367 this_sequence A086369 A086370 A086371

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Sep 05 2003

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.


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