22788Re: Primes >2
- Jul 7, 2011--- In email@example.com, Dana Edgecomb <dedgecomb@...> wrote:
>How about 2^43112609-1? It has zero -- an even number -- of 0's and an odd number of 1's, in base 2.
> Prime numbers greater than two are those numbers, expressed in base two,
> which contain a one in the rightmost position and and odd number of
> ones, or (excluding leading zeroes) an odd number of zeroes, if there
> are any.
> Any base two number greater than two, with a zero in the rightmost
> position is naturally a multiple of two, and hence not prime.
> Any base two number with an even number of zeroes is naturally a
> multiple of two smaller numbers, and hence not prime.
7 = (111)_2 also fits,
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