ART

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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