triangular number

Fetched 2026-10-26 (cache).

Synonyms: triangular numbers

Antonyms: triangular numbers

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|mathematics}} Any [[integer]] that is the [[sum]] of ''n'' [[natural number]]s from 1 to ''n''.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.