33
33 = 3*11
233 - 1 = 7 * 23 * 89 * 599479
1033 - 1 = 3 * 3 * 3 * 37 * 67 * 21649 * 513239 * 1344628210313298373
32 - 33 - 34
Mathematics Encyclopedia
Hellenica World - Scientific Library
