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A067349
Number of divisors of sigma(n)+phi(n).
3
2, 3, 4, 3, 4, 4, 4, 2, 2, 4, 4, 6, 4, 8, 6, 4, 4, 6, 4, 6, 6, 4, 4, 6, 4, 8, 4, 6, 4, 10, 4, 2, 6, 8, 12, 2, 4, 8, 10, 4, 4, 12, 4, 8, 8, 4, 4, 12, 6, 2, 8, 4, 4, 8, 10, 15, 6, 4, 4, 8, 4, 12, 12, 4, 12, 6, 4, 4, 12, 16, 4, 4, 4, 12, 6, 10, 12, 14, 4, 4, 6, 4, 4, 8, 6, 8, 10, 12, 4, 8, 8, 6, 6, 8
OFFSET
1,1
LINKS
FORMULA
a(n) = A000005(A000010(n) + A000203(n)).
MATHEMATICA
Table[ DivisorSigma[ 0, DivisorSigma[ 1, w ]+EulerPhi[ w ] ], {w, 1, 128} ]
PROG
(PARI) a(n) = numdiv(sigma(n)+eulerphi(n)); \\ Michel Marcus, Aug 13 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 17 2002
STATUS
approved