A062502 Number of prime divisors (with repetition) of the nonprimes (including 1).

0, 2, 2, 3, 2, 2, 3, 2, 2, 4, 3, 3, 2, 2, 4, 2, 2, 3, 3, 3, 5, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 5, 2, 3, 2, 3, 4, 2, 4, 2, 2, 4, 2, 3, 6, 2, 3, 3, 2, 3, 5, 2, 3, 3, 2, 3, 5, 4, 2, 4, 2, 2, 2, 4, 4, 2, 3, 2, 2, 2, 6, 3, 3, 4, 3, 4, 3, 2, 5, 3, 2, 5, 3, 2, 3, 3, 2, 2, 5, 2, 2, 2, 3, 3, 4, 7, 2, 3, 4, 2, 2, 4, 4, 3

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

a(n) = A001222(A018252(n)). - Sean A. Irvine, Mar 31 2023

Maple

f:= proc(n) if not isprime(n) then numtheory:-bigomega(n) fi end proc:
map(f, [$1..200]); # Robert Israel, Oct 01 2020

Mathematica

PrimeOmega/@Complement[Range[200], Prime[Range[PrimePi[200]]]]  (* Harvey P. Dale, Apr 22 2011 *)

Prog

(PARI) je=[]; for(n=1, 300, if(isprime(n), n+1, x=bigomega(n); je=concat(je, x))); je

Crossrefs

Cf. A001222, A018252.

Sequence in context: A087159 A366922 A218800 * A141242 A130451 A130285

Adjacent sequences: A062499 A062500 A062501 * A062503 A062504 A062505

Keyword

nonn

Author

Jason Earls, Jul 09 2001

Status

approved