OFFSET
0,5
COMMENTS
A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798.
EXAMPLE
The prime indices of 12 are {1,1,2}, with average 4/3, so a(12) = 3.
MATHEMATICA
Table[Denominator[Sum[q[[2]]*PrimePi[q[[1]]], {q, FactorInteger[n]}]/PrimeOmega[n]], {n, 2, 100}]
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Gus Wiseman, Jul 13 2019
STATUS
approved