sum*product = n
Robert G. Wilson v
rgwv at kspaint.com
Tue Dec 11 20:16:49 CET 2001
Et al,
Using Mathematica, I have tested the sequence up to 7.5*10^7 and
have found no further numbers which satisfy the criteria.
Bob.
"N. J. A. Sloane" wrote:
> Sol Golomb recently mentioned an old puzzle:
>
> find all n such that sum of digits of n times
> product of digits of n is equal to n
>
> this is a finite sequence which begins 1, 135, 144
>
> does any seq fan know of further terms?
>
> Neil
>
> e g (1+3+5)*1*3*5) = 135
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