17

This number is a prime.

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Prime Numbers CD Image J. Neptune © 1994

17 + 2¹, 17 + 2¹ + 2², 17 + 2¹ + 2² + 2³, 17 + 2¹ + 2² + 2³ + 2⁴ and 17 + 2¹ + 2² + 2³ + 2⁴ + 2⁵ are primes. [Luhn]