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A151948
a(n) = tau(sigma(phi(n))).
1
1, 1, 2, 2, 2, 2, 6, 2, 6, 2, 6, 2, 6, 6, 4, 4, 2, 6, 4, 4, 6, 6, 9, 4, 8, 6, 4, 6, 8, 4, 12, 2, 8, 2, 12, 6, 4, 4, 12, 2, 12, 6, 12, 8, 12, 9, 12, 2, 12, 8, 6, 12, 6, 4, 12, 12, 4, 8, 12, 2, 16, 12, 4, 6, 6, 8, 15, 6, 12, 12, 15, 12, 8, 4, 12, 4, 16, 12, 16
OFFSET
1,3
LINKS
FORMULA
PROG
(PARI) A151948(n) = numdiv(sigma(eulerphi(n))); \\ Antti Karttunen, Aug 22 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jul 20 2009
STATUS
approved