2,3

a(n)=0 for prime n.

Table of n, a(n) for n=2..80.

a(n) = n - A006530(n). - Michel Marcus, Jan 16 2015

Table[n-Last@(First/@FactorInteger[n]), {n, 2, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 08 2011 *)

Cf. A006530, A070229.

Sequence in context: A130628 A249431 A331176 * A163974 A317443 A308218

Adjacent sequences: A076560 A076561 A076562 * A076564 A076565 A076566

easy,nonn

Zak Seidov, Oct 19 2002

approved