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Just showing those entries submitted by 'Caldwell': (Click here to show all)

The sum of the reciprocals of the primes is infinite, but the sum of the reciprocals of the known primes is less than 5 and will always be so! [Caldwell]

Every positive integer can be written as x²+2y²+7z²+11w², except for 5. [Halmos1938] [Caldwell]