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A121287 Numbers such that Sigma(n)*UnitarySigma(n) is divisible by UnitaryPhi(n)*n. 1
1, 6, 60, 140, 8190, 32760 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

{n: (n*A047994(n)) | (sigma(n)*A034448(n)) }.

CROSSREFS

Cf. A121288.

Sequence in context: A137498 A036283 A126576 * A069072 A074441 A006741

Adjacent sequences:  A121284 A121285 A121286 * A121288 A121289 A121290

KEYWORD

nonn

AUTHOR

Yasutoshi Kohmoto zbi74583(AT)boat.zero.ad.jp Sep 05 2006

EXTENSIONS

Typo in the name fixed.

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Last modified February 14 08:46 EST 2012. Contains 205614 sequences.