17 Prime number, third Fermat prime
17 = 14 + 24
17 = (4 + 9 + 1 + 3) 173 = 4913
217 - 1 = 131071
1017 - 1 = 3 * 3 * 2071723 * 5363222357
16 - 17 - 18
0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9
Mathematics Encyclopedia
Hellenica World - Scientific Library
