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A361788
Number of divisors of n that are totient values (A002202).
0
1, 2, 1, 3, 1, 3, 1, 4, 1, 3, 1, 5, 1, 2, 1, 5, 1, 4, 1, 5, 1, 3, 1, 7, 1, 2, 1, 4, 1, 5, 1, 6, 1, 2, 1, 7, 1, 2, 1, 7, 1, 4, 1, 5, 1, 3, 1, 9, 1, 3, 1, 4, 1, 5, 1, 6, 1, 3, 1, 9, 1, 2, 1, 7, 1, 5, 1, 3, 1, 4, 1, 10, 1, 2, 1, 3, 1, 4, 1, 9, 1, 3, 1, 8, 1, 2, 1, 7, 1, 6
OFFSET
1,2
FORMULA
a(n) <= A000005(n) with equality if n is in A000079.
a(n) = 1 for odd numbers (A005408).
PROG
(PARI) a(n) = sumdiv(n, d, istotient(d));
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Mar 24 2023
STATUS
approved