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Science
Math
Number Theory
Open Problems
Unsolved problems in Number Theory
ABC Conjecture
The ABC or Masser--Oesterle' Conjecture in Number Theory
Catalan Conjecture
Sites related to the Catalan Conjecture, that 8 and 9 are the only consecutive powers.
Collatz Problem
The Collatz, Syracuse or 3x+1 problem
Goldbach Conjecture
Goldbach conjectured that every even number is the sum of two primes.
Lychrel Numbers
Numbers not known to yield a palindrome under repeated applications of the reverse-decimal-digits--then--add map.
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