The book is now available! 905
(another Prime Pages' Curiosity)
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+ Most odd integers can be written as the sum of a prime and a power of two in at least one way. Ones which cannot are called obstinate numbers. They form an infinite set but are not all that common. The first composite obstinate number is 905. [Ajax]

(There is one curio for this number that has not yet been approved by an editor.)




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