Smallest prime factor of greatest proper divisor of n.

Terms

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