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Search: id:A007668
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A007668 phi(n) divides sigma(n) and sigma(n)/n > sigma(m)/m for all m < n. +0
1
1, 2, 6, 12, 840, 332640 (list; graph; listen)
OFFSET

1,2
LINKS

Walter Nissen, Home Page (listed in lieu of email address)

CROSSREFS

Cf. A020492, A004394.

Sequence in context: A058046 A074180 A126293 this_sequence A089415 A161324 A116534

Adjacent sequences: A007665 A007666 A007667 this_sequence A007669 A007670 A007671

KEYWORD

nonn

AUTHOR

Walter Nissen

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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