Integers whose Divisor Sum is Cube/Mistake
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Source Work
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $110$
Mistake
- $\map \sigma {110} = 216 = 6^3$, the first $n$, after $n = 1, 7$, for which $\map \sigma n$ is a cube.
Correction
It is in fact the $2$nd $n$ after $n = 1, 7$, for which $\map \sigma n$ is a cube.
That is, it is the $4$th such $n$ altogether.
From Integers whose Divisor Sum is Cube, the sequence is in fact:
- $1, 7, 102, 110, 142, 159, 187, 381, 690, 714, 770, 994, 1034, \ldots$
So $102$ in particular has been missed.
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $110$