Products of nonprimitive roots of n, or 0 if n = 2 or has no primitive roots.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =24a(6) =48a(7) =0a(8) =4032a(9) =17280a(10) =5400a(11) =0a(12) =518400a(13) =415134720a(14) =0a(15) =0a(16) =1797120a(18) =39086530560a(19) =0a(20) =0a(22) =10247897088a(23) =0a(27) =0a(29) =0