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- Every Positive Integer Van Be Written as the Sum of Three Triangular Numbers
- Three Smallest Integers Greater Than 1000 Which Cannot Be Written as the Sum of Three Squares
- For p=4k+1 Prime, Writing 2p Uniquely as Sum of Two Squares
- If Two Numbers are Expressible as Sums of Two Squares and One Divides the Other, Is the Result Also Expressible As a Sum of Two Squares?
- Writing a Product as a Sum of Two Squares