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Triangular number

noun

Definitions

1.nounAny integer that is the sum of n natural numbers from 1 to n.
"Ten is a triangular number being the sum of 1, 2, 3, and 4."

Synonyms

tetrahedral numberternionn-tupletripletriangularizationtriangularisationtrianglethreenessthreesidetriacontadtriadnumber
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