John R Pierce wrote:
> Chris Caldwell wrote:
>>> i have figured out that most numbers with all 1s for digits
>>> are prime with this one exception if the number has 3 6 9 12
>>> 15 and all other numbers that have 3 as a factor for the
>>> amount if digits in the number. There for 10 million 1s would
>>> be prime.
>>>
>>
>> Very very few numbers with all ones are prime. Why
>> not test your theory with the numbers with from one to thirty
>> ones which are trivial to factor?
>>
>> Heck, just factor this one: 1111 and put and end to
>> your "all prime" theory.
>>
>
> note they didn't specify which base this is in. 'all 1s' in binary
> describes all mersenne numbers, of which we well know most aren't prime.
Yes, he does, because he uses a divisibility rule which works only
in denary.
Mike
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