triangular number
noun1
Mathematics, Sciences Any 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
- triangle number, termial
- Hyponyms
- hexagonal number
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.