# 73

This number is a prime.

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There are exactly 73 primes, beginning with the prime 1093 and ending
with the prime 1613, where 1093^{2}+ 1097

^{2}+ ... + 1613

^{2}= 11707

^{2}. This is the first instance of a prime number of primes comprising the left member of such an equation. [Haga]

Submitted: 1999-09-02 23:40:00; Last Modified: 2008-01-30 17:28:00.

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