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Can you find formula and it's derivation for finding numbers which are square-triangular ?

Note by Shivamani Patil 2 years, 12 months ago

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Same as a problem by Calvin Lin which asked when 1+2+...+N is a square.Simple Pell equation

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TopNewestSame as a problem by Calvin Lin which asked when 1+2+...+N is a square.Simple Pell equation

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