Quantum redactiones paginae "Numerus triangularis" differant

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m (robot Adding: hu:Háromszögszámok)
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|[[Image:Square trianglenumber 16 as sum 16of two triangular numbers.pngsvg]]
|[[Image:Square trianglenumber 25 as sum 25of two triangular numbers.pngsvg]]
Quadrati facti duobus numeris triangularibus consequentibus aduinctis.
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