Prime Curios!: 218

218
(another Prime Pages' Curiosity)

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218 = 7² + 13². Note that 7 and 13 are the smallest primes for which there is no easy divisibility check in base 10. [Pfannerer]

Submitted: 2002-09-09 11:49:07; Last Modified: 2008-01-30 11:28:00.