15547Re: [PrimeNumbers] Extension of Cunningham chains
- Nov 13, 2004Jack wrote:-
>>Can anybody find any longer such chains each with an equal numberI wrote:
>>of divisors, either with 4, 8, or some other number?
>With 3 divisors, each must be the square of a prime, of course.In fact, there are chains of length 2, but no longer.
>Are there any such chains of length > 1? (I haven't searched.)
The first few are:-
The proof is relatively straightforward.
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