Second factor in happy factorization of n.

Terms

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