17

This number is a prime.

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Prime Numbers CD Image J. Neptune © 1994

The least integer such that the sum of its digits in every base B = 2, 3, 4, 5, 6, 7, 8 is prime. [Crespi de Valldaura]

The least prime that is the sum of two fourth powers, 1⁴ + 2⁴. [Crespi de Valldaura]

17² can be expressed as the sum of 1, 2, 3, 4, 5, 6, 7, 8 distinct squares. [Crespi de Valldaura]