Un numero intero positivo si dice triangolare se è uguale alla somma di una sequenza di numeri consecutivi a partire da 1.
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Il 1º Numero Triangolare è: 1
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Il 2º Numero Triangolare è: 3
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Il 3º Numero Triangolare è: 6
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Il 4º Numero Triangolare è: 10
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Il 5º Numero Triangolare è: 15
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Il 10º Numero Triangolare è: 55
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Il 50º Numero Triangolare è: 1275