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Triangular numbers, proving numbers are tringular
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Similar Threads for Triangular numbers proving 

A Choices of Axiomatic and Number Systems / Sets and Alternatives 
B Abundant Number Properities 
B Fermat's little theorem proof? 
I Proof that 1 is an odd number using Peano Axioms of naturals 
B What is the name of this triangular geometric shape? 