Definition:Giuga Number/Mistake
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Source Work
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $30$
Mistake
- $1/2 + 1/3 + 1/5 - 1/30 = 1$, so $30$ is a Guiga number, the smallest.
The name is Giuseppe Giuga, not Guiga.
The mistake is repeated in entry $244,197,000,982,499,715,087,866,346$:
- A large Guiga number, equal to $2 \times 3 \times 11 \times 23 \times 31 \times 47 \, 137 \times 28 \, 282 \, 147 \times 3 \, 892 \, 535 \, 183$.
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $30$