2006-01-15, 13:29 #21 Kosmaj     Nov 2003 1110001001102 Posts All right, thanks. BTW, I just ran into the first DodecaProth for n=70: 14494401979227555 70 [2E16] Note that k has 17 digits. k*2^n+/-1 members have 38, while 2^n+/-k have 22 digits. One leg on the left and one on the right. I'm also enclosing a Pari script I use to verify DodecaProths and count legs. To use it start Pari from the folder where you saved the file, then type: Code: gp> read("isddp.txt") gp> isddp(14494401979227555,70) 14494401979227555 70 is DodecaProth! ... Left_legs=1, Rigth_legs=1.