Legendre's three-square theorem

theorem that every nonnegative integer is the sum of three perfect squares unless it is a product of a power of four and a number that is 7 modulo 8
Intangible theorem Q15940470
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Legendre's three-square theorem

Summary

Legendre's three-square theorem is a theorem[1]. It draws 128 Wikipedia views per month (theorem category, ranking #169 of 1,306).[2]

Key Facts

  • Legendre's three-square theorem's instance of is recorded as theorem[3].
  • Legendre's three-square theorem's Freebase ID is recorded as /m/0y4wpxy[4].
  • Legendre's three-square theorem's defining formula is recorded as \forall n\in\mathbb N\colon(\exists(a,b,c)\in\mathbb Z^3\colon n=a^2+b^2+c^2)\iff n\not\in{4^a(8b+7)\colon a,b\in\mathbb N}[5].
  • Legendre's three-square theorem's studied by is recorded as number theory[6].
  • Legendre's three-square theorem's Google Knowledge Graph ID is recorded as /g/121v2dsq[7].
  • Legendre's three-square theorem's maintained by WikiProject is recorded as WikiProject Mathematics[8].

Why It Matters

Legendre's three-square theorem draws 128 Wikipedia views per month (theorem category, ranking #169 of 1,306).[2] It has Wikipedia articles in 12 language editions, a strong signal of global cultural recognition.[9]

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Legendre's three-square theorem. Retrieved May 3, 2026, from https://4ort.xyz/entity/legendre-s-three-square-theorem
MLA “Legendre's three-square theorem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/legendre-s-three-square-theorem.
BibTeX @misc{4ortxyz_legendre-s-three-square-theorem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Legendre's three-square theorem}}, year = {2026}, url = {https://4ort.xyz/entity/legendre-s-three-square-theorem}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Legendre's three-square theorem — https://4ort.xyz/entity/legendre-s-three-square-theorem (retrieved 2026-05-03)

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