[seqfan] Re: Knife numbers
Eric Angelini
Eric.Angelini at kntv.be
Sat Sep 20 23:11:14 CEST 2014
P.-S.
Is 216 the first 2-Knife number?
216/(21+6)=8
216/(2+16)=12
More 2-Knife numbers?
3-Knife, 4-Knife, ...
Best,
É.
> Le 20 sept. 2014 à 22:58, "Eric Angelini" <Eric.Angelini at kntv.be> a écrit :
>
>
> Hello SeqFans,
> If I'm not wrong, the "Knife numbers"
> (as we might call them) are not in the
> database.
>
> A "knife number" K can be divided
> in two chunks P and Q such that P+Q
> divide K.
>
> K = 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42, 45, 48, 50, 54, 60, 63, 70, 72, 80, 81, 84, 90, 105, 108, 110, 120, 126, 130, 132,...
>
> Examples:
> 12 is divisible by 1+2 (result = 4)
> 126 is divisible by 12+6 (result = 7)
> 132 is divisible by 1+32 (result = 4)
> ...
> Best,
> É.
>
>
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