Re: Anyone know something about this problem?

mmeron_at_cars3.uchicago.edu
Date: 11/18/04 

Date: Thu, 18 Nov 2004 23:57:47 GMT

In article <%cand.425137$D%.408648@attbi_s51>, Sam Wormley <swormley1@mchsi.com> writes:
>Adi Anant wrote:
>> If I type random series of digits, what is the probability that a
>> length of n such digits makes a prime number?
>> For ex., 23867234231001
>> 2 is prime, 23 is prime, 238 is not prime etc.
>> Anyone know if such a probability can be calculated (even if it needs
>> a data set of 10 million sequential prime numbers, say).
>>
>> Thanks.
>>
>> Adi Anant
>
>The digits sum to a number evenly disisable by 3... it is not prime
>
>{{3, 1}, {7, 1}, {1136534963381, 1}
>
That wasn't the question. In fact, it is not even clear what the
question is. As asked first, it appears to be:

"If I generate a random n-digit number, what is the probability that
this number is prime"?

But the following example seems to indicate the interpretation of

"If I pick a random sequence of n digits, what is the probability that
a number generated from any consecutive subsequence of said sequence
is prime"?

So, which one it is?

Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"

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