OFFSET
1,7
COMMENTS
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
FORMULA
EXAMPLE
a(63) = 3 because phi(63) = 36 with 3 odd divisors {1, 3, 9}.
MATHEMATICA
f[n_] := Block[{d = Divisors[EulerPhi[n]]}, Count[OddQ[d], True]]; Table[f[n], {n, 80}]
PROG
(PARI) A193453(n) = sumdiv(eulerphi(n), d, d%2); \\ Antti Karttunen, Dec 04 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Jul 26 2011
EXTENSIONS
More terms from Antti Karttunen, Dec 04 2017
STATUS
approved