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Changing link to already existing, better page on perfect numbers
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*Unsolved problems:  proving that there are infinitely many [[twin primes]]
 
*Unsolved problems:  proving that there are infinitely many [[twin primes]]
 
*Problems solved only with proof-by-contradiction: always a prime between n and 2n (n>1)
 
*Problems solved only with proof-by-contradiction: always a prime between n and 2n (n>1)
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*[[perfect numbers]]
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*[[perfect number]]s
 
*[[additive factoring]]
 
*[[additive factoring]]
 
*[[prime number theorem]]
 
*[[prime number theorem]]
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