On Sun, Jan 22, 2006 at 07:59:15PM +0100, Schneelocke wrote:
> I *think* what he means is this:
>
> Define a_0 = 13901, b_0 = 5019630, a_{n+1} = a_n * b_n, b_{n+1} = a_n
> + b_n. Then b_n is conjectured to always be prime (above a certain n,
> I assume, at least).
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> [13901, 5019360]; [isprime(%[1]), isprime(%[2])];
[13901, 5019360]
[true, false]
> [%%[1] * %%[2], %%[1] + %%[2]]; [isprime(%[1]), isprime(%[2])];
[69774123360, 5033261]
[false, false]
> [%%[1] * %%[2], %%[1] + %%[2]]; [isprime(%[1]), isprime(%[2])];
[351191373917076960,
69779156621]
[false, true]
> [%%[1] * %%[2], %%[1] + %%[2]]; [isprime(%[1]), isprime(%[2])];
[24505837884503887458350552160,
351191443696233581]
[false, false]
> [%%[1] * %%[2], %%[1] + %%[2]]; [isprime(%[1]), isprime(%[2])];
[8606240585644774841341338786465560163684084960,
24505837884855078902046785741]
[false, false]
Clearly this conjuncture is not worth very much. :-)
/* Steinar */
--
Homepage: http://www.sesse.net/
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