a(n) is smallest number with divisors which are congruent to 1, 2, ..., n-1 mod n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =8a(5) =30a(6) =12a(7) =60a(8) =96a(9) =270a(10) =90a(11) =420a(12) =72a(13) =1638a(14) =840a(15) =1080a(16) =300a(17) =4410a(18) =432a(19) =5940a(20) =3360a(21) =6930a(22) =540a(23) =10920a(24) =2880a(25) =19890a(26) =9360a(27) =27300a(28) =1680a(29) =43890