A square triangular number is a number that is both a triangular number and a perfect square, meaning the sum of all integers from 1 to some n is itself a number with an integer square root. The first few square triangular numbers are 0, 1, 36, 1225 and 41616. There are infinitely many of them, though they become increasingly rare as the values grow larger. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
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Is Kind Of Object
Entity-backed identity for the object-kind enum value this mathematical object already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The object-kind fact itself stays on the object unchanged.
Sources
1. Square Triangular Number (Wikipedia)
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