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A015722 Composite and odd n such that phi(n) * sigma(n) is one less than a square. +0
3
33, 69, 295, 423, 451, 531, 581, 1119, 2893, 4043, 4163, 4257, 4509, 5975, 12977, 14927, 15753, 19105, 25369, 27225, 38013, 38799, 39771, 85675, 98531, 157375, 217349, 264439, 324643, 330977, 352593, 382881, 417661 (list; graph; listen)
OFFSET

0,1
REFERENCES

R. K. Guy, Divisors and desires, Amer. Math. Monthly, 104 (1997), 359-360.

CROSSREFS

Sequence in context: A055078 A044135 A044516 this_sequence A103046 A063868 A049012

Adjacent sequences: A015719 A015720 A015721 this_sequence A015723 A015724 A015725

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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