Shanks(5-)
Phi10(2^5^m) = 16^5^m-8^5^m+4^5^m-2^5^m+1

factors: k*(2*5^(m+1))+1  see 5-Proths

0 11
1 251 * 4051
2 229668251 * 5519485418336288303251
3 619324035675566251 (#52) * 232983411264923603130001 (#367) * C(110) #447
4
5
6
7
8
9

(0) 2*5^1
11-1 = 2 * 5

(1) 2*5^2
251-1 = 2 * 5^3
4051-1 = 2 * 3^4 * 5^2

(2) 2*5^3
229668251-1 = 2 * 5^3 * 7 * 37 * 3547
5519485418336288303251-1 = 2 * 3 * 5^3 * 179 * 41113485425223749

(3) 2*5^4
619324035675566251-1 = 2 * 3 * 5^4 * 1498333 * 110224547
232983411264923603130001-1 = 2^4 * 3^2 * 5^4 * 7 * 11 * 33619539865068341




2*5^1+1 Phi10(2^5^0)
2*5^3+1 Phi10(2^5^1)