1,1

Complement of set {A(noncomposite number(n)*n)} = {A164931(n)} = {A(A008578(n)*A000027(n))}.

Table of n, a(n) for n=1..50.

Sequence in context: A028729 A213367 A175084 * A072099 A046841 A244218

Adjacent sequences: A171516 A171517 A171518 * A171520 A171521 A171522

nonn

Jaroslav Krizek, Dec 11 2009

approved