OFFSET
1,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..325
EXAMPLE
H(1) = 1 = 1/1, the numerator is the empty product, whence a(1) = 0.
H(2) = 1 + 1/2 = 3/2 and H(3) = 3/2 + 1/3 = 11/6, 3 and 11 are prime numbers, whence a(2) = a(3) = 1.
H(4) = 11/6 + 1/4 = 25/12, 25 = 5^2, whence a(4) = 2.
MATHEMATICA
Table[PrimeOmega @ Numerator[HarmonicNumber[n]], {n, 30}] (* Amiram Eldar, Feb 24 2020 *)
PROG
(PARI) a(n)=bigomega(A001008(n))
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Jul 03 2019
STATUS
approved