a(1)=5; for n >= 2, if n = Product p_i^e_i, then a(n) = Product p_{i+3}^e_i.

Terms

a(0) =5a(1) =7a(2) =11a(3) =49a(4) =13a(5) =77a(6) =17a(7) =343a(8) =121a(9) =91a(10) =19a(11) =539a(12) =23a(13) =119a(14) =143a(15) =2401a(16) =29a(17) =847a(18) =31a(19) =637a(20) =187a(21) =133a(22) =37a(23) =3773a(24) =169a(25) =161a(26) =1331a(27) =833a(28) =41a(29) =1001