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A007668 phi(n) divides sigma(n) and sigma(n)/n > sigma(m)/m for all m < n. 0
1, 2, 6, 12, 840, 332640 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Cf. A020492, A004394.

Sequence in context: A192321 A074180 A126293 * A089415 A181063 A161324

Adjacent sequences:  A007665 A007666 A007667 * A007669 A007670 A007671

KEYWORD

nonn

AUTHOR

Walter Nissen

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Last modified February 15 10:06 EST 2012. Contains 205763 sequences.