OFFSET
1,1
COMMENTS
a(n) is even for all n, because if k is a solution to iphi(k) = n, and A007814(k) is even, then 2*k is also a solution, i.e., iphi(2*k) = n.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
a(A362486(n)) = 0.
MATHEMATICA
a[n_] := Length[invIPhi[n]]; Array[a, 100] (* using the function invIPhi from A362484 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Apr 22 2023
STATUS
approved