# Sums of Squares/Mistake/Second Edition

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## Source Work

1994: Richard K. Guy: *Unsolved Problems in Number Theory* (2nd ed.):

- $\mathbf C$: Additive Number Theory
- $\mathbf {C 20}$: Sums of Squares

## Mistake

*Apart from $256$ examples, the largest of which is $1167$, every number can be expressed as the sum of at most five*composite*numbers.*

## Correction

It should say:

*Apart from $256$ examples, the largest of which is $1167$, every number can be expressed as the sum of at most five*composite**squares of***numbers.*

(emphasis added)

This has been corrected for *Unsolved Problems in Number Theory, 3rd ed.*.

## Also see

## Sources

- 1994: Richard K. Guy:
*Unsolved Problems in Number Theory*(2nd ed.): $\mathbf C$: Additive Number Theory: $\mathbf {C 20}$: Sums of Squares