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Search: id:A087249
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A087249 n is square-free but sigma[n] is not square-free. +0
3
3, 6, 7, 10, 11, 14, 15, 17, 19, 21, 22, 23, 30, 31, 33, 34, 35, 38, 39, 42, 43, 46, 47, 51, 53, 55, 57, 58, 59, 62, 65, 66, 67, 69, 70, 71, 77, 78, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 102, 103, 105, 106, 107, 110, 111, 114, 115, 118, 119, 123, 127, 129, 130 (list; graph; listen)
OFFSET

1,1

EXAMPLE

n=7 and sigma[7]=2.2.2=8; n=10 and sigma[10]=1+2+5+10=18=2.3.3.

CROSSREFS

Cf. A065303, A087248, A065301.

Sequence in context: A023982 A039591 A114082 this_sequence A091087 A138622 A080147

Adjacent sequences: A087246 A087247 A087248 this_sequence A087250 A087251 A087252

KEYWORD

nonn

AUTHOR

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

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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