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Theorem

Nicomachus's Theorem

Combinatorics and Graph Theory

Nicomachus's theorem is the identity stating that the sum of the first n cubes equals the square of the nth triangular number, so that 1 cubed plus 2 cubed plus 3 cubed and so on up to n cubed equals the square of the sum 1 plus 2 plus 3 up to n. The identity is attributed to Nicomachus of Gerasa, who lived from around 60 to 120 CE and observed that summing consecutive blocks of odd numbers produces successive cubes, without giving a formal proof of the pattern himself. 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
Classification
Statement Form
Identity or Equation 1
Connections

Has Statement Form

Equation, Concepts

Entity-backed identity for the statement-form enum value this theorem 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 statement-form fact itself stays on the theorem unchanged.

Identity, Concepts

Entity-backed identity for the statement-form enum value this theorem 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 statement-form fact itself stays on the theorem unchanged.

In Branch

Source Squared triangular number (Wikipedia)
Sources
1. Squared triangular number (Wikipedia)
In Branch: Number Theory, Lead sentence
Quote, In Branch: Number Theory, Lead sentence
In number theory, the sum of the first n cubes is the square of the nth triangular number.
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