If n = p_1^e_1 * ... * p_k^e_k, p_1 < ... < p_k primes, then a(n) = n/p_1^e_1, with a(1) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =1a(7) =1a(8) =1a(9) =5a(10) =1a(11) =3a(12) =1a(13) =7a(14) =5a(15) =1a(16) =1a(17) =9a(18) =1a(19) =5a(20) =7a(21) =11a(22) =1a(23) =3a(24) =1a(25) =13a(26) =1a(27) =7a(28) =1a(29) =15