499
This number is a prime.

A Knight's Tour 
A knight's tour is a numbered tour of a knight over an otherwise empty chessboard visiting each square once only. A queen placed on the start of a tour discovered by George Jelliss can attack all of the odd
primes, and every odd number attacked by the queen is a
prime. It is also a more restricted version known as a reentrant tour, in which the knight, on its 64th move, could arrive back at its starting square. The sum of the odd
primes in the tour is 499.
Submitted: 20080220 21:58:54; Last Modified: 20090312 20:44:46.
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