by Ciro Santilli (@cirosantilli, 34)
4 squares are sufficient by Lagrange's four-square theorem.
The subsets reachable with 2 and 3 squares are fully characterized by Legendre's three-square theorem and

Ancestors (13)

  1. Waring's problem
  2. Additive basis theorem
  3. Additive basis
  4. Additive number theory
  5. Diophantine equation
  6. Polynomial
  7. Numeric function
  8. Function by signature
  9. Function (mathematics)
  10. Formalization of mathematics
  11. Area of mathematics
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