[seqfan] Re: Knife numbers

[Eric Angelini]

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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