OFFSET
2,3
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
MATHEMATICA
primeMS[n_]:=If[n==1, {}, Flatten[Cases[FactorInteger[n], {p_, k_}:>Table[PrimePi[p], {k}]]]];
Table[Denominator[Times@@primeMS[n]/Plus@@primeMS[n]], {n, 2, 100}]
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Gus Wiseman, Jun 09 2019
STATUS
approved