Phi12(2^12^m)
 = Phi6(4^12^m) = Phi3(-4^12^m) = 16^12^m-4^12^m+1
Shanks(12)

0 13
1 577 * 487824887233
2 1718990209 * 8148919324033 * C(152)
3 872256417178360321 * C(2063)



(0) 12^1
13-1 = 2^2 * 3

(1) 12^2
577-1 = 2^6 * 3^2
487824887233-1 = 2^6 * 3^5 * 1091 * 28751

(2) 12^3
1718990209-1 = 2^7 * 3^3 * 13 * 38261
8148919324033-1 = 2^7 * 3^7 * 167 * 174311

(3) 12^4
872256417178360321-1 = 2^9 * 3^4 * 5 * 1231 * 1567 * 2180681