Phi18(2^18^m)
 = Phi6(8^18^m) = Phi3(-8^18^m) = 64^18^m-8^18^m+1
Shanks(18)

0 3 * 19
1 3618757 * 106979941 * 168410989 * 4977454861
2 139969 * C(581)
3 C(10534)



(0) 18^1
3 exception
19-1 = 2 * 3^2

(1) 18^2
3618757-1 = 2^2 * 3^6 * 17 * 73
106979941-1 = 2^2 * 3^4 * 5 * 66037
168410989-1 = 2^2 * 3^4 * 519787
4977454861-1 = 2^2 * 3^4 * 5 * 7 * 31 * 14159

(2) 18^3
139969-1 = 2^6 * 3^7