a(1) = 0, for primes p, a(p) = 1, and for any other number n, a(n) = max(A003415(n), A276086(n)).

Terms

a(0) =0a(1) =1a(2) =1a(3) =9a(4) =1a(5) =5a(6) =1a(7) =15a(8) =30a(9) =45a(10) =1a(11) =25a(12) =1a(13) =75a(14) =150a(15) =225a(16) =1a(17) =125a(18) =1a(19) =375a(20) =750a(21) =1125a(22) =1a(23) =625a(24) =1250a(25) =1875a(26) =3750a(27) =5625a(28) =1a(29) =31