Word:

Triangular numbers

(Math.) the series of numbers formed by the successive sums of the terms of an arithmetical progression, of which the first term and the common difference are 1. See Figurate numbers, under Figurate.

See also: Triangular

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Trialeurodes vaporariorum
Triality
Trialogue
triamcinolone
Triamide
Triamine
Triander
Triandria
Triandrian
Triangle
Triangle spider
Triangled
Triangular
triangular bandage
Triangular compasses
Triangular crab
-- Triangular numbers --
triangular prism
Triangulares
Triangularity
Triangularly
Triangulate
Triangulation
Triangulum
Triangulum Australe
Triarchy
Triarian
Triarticulate
Trias
Triassic
Triassic period
Triatic
Triatic stay
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