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A067781 Numbers n such that phi(n) and sigma(n) are simultaneously perfect squares. 2
1, 170, 364, 679, 5044, 5130, 5670, 5770, 8721, 8736, 9154, 9639, 9809, 14322, 16376, 22413, 27783, 30256, 32025, 37114, 38760, 51455, 71604, 78570, 82615, 88392, 92004, 100821, 101153, 104168, 115430, 121056, 133569, 139954, 148568 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
A subsequence of A011257. - M. F. Hasler, Sep 22 2009
LINKS
FORMULA
A067781 = A006532 intersect A039770. - M. F. Hasler, Sep 22 2009
CROSSREFS
Sequence in context: A043762 A043771 A158221 * A043344 A045153 A045041
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 07 2002
STATUS
approved

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Last modified July 25 14:33 EDT 2024. Contains 374609 sequences. (Running on oeis4.)