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• ... 2^5 = 32. ITYM All their _odd_ additive combinations. Phil
Message 1 of 3 , Nov 12 10:52 PM
--- On Thu, 11/13/08, Mark Underwood <mark.underwood@...> wrote:
> The five numbers 3, 2*3^2, 2^2*3*5, 2^2*3^3 and 2^3*5^2
> (3,18,60,108 and 200)
> have all 16 of their additive combinations prime:
> 11 17 47 53 131 137 167 173 227
> 233 263 269 347 353 383 389.

2^5 = 32. ITYM All their _odd_ additive combinations.

Phil
• ... Yes there would indeed be 32 additive combinations with five numbers, but half of these would just be the negatives of the other half, so I go with 16. In
Message 2 of 3 , Nov 13 4:57 AM
--- In primenumbers@yahoogroups.com, Phil Carmody <thefatphil@...> wrote:
>
> --- On Thu, 11/13/08, Mark Underwood <mark.underwood@...> wrote:
> > The five numbers 3, 2*3^2, 2^2*3*5, 2^2*3^3 and 2^3*5^2
> > (3,18,60,108 and 200)
> > have all 16 of their additive combinations prime:
> > 11 17 47 53 131 137 167 173 227
> > 233 263 269 347 353 383 389.
>
> 2^5 = 32. ITYM All their _odd_ additive combinations.
>

Yes there would indeed be 32 additive combinations with five numbers, but half of these
would just be the negatives of the other half, so I go with 16. In this case, I keep the 200
positive, and the other four: 3,18,60 and 108 go positive and negative.

Mark
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