[seqfan] RE : Re: Rank of a prime (Collatz/Syracuse)
Eric.Angelini at kntv.be
Sun Feb 1 09:10:55 CET 2009
> Number of iterations to repeat a term.
... Thanks to all for the nice computations (Jacques, Edwin, Robert G., Maximilian, etc.)
De: seqfan-bounces at list.seqfan.eu de la part de Robert G. Wilson, v
Date: dim. 01/02/2009 06:44
À: Sequence Fanatics Discussion list
Objet : [seqfan] Re: Rank of a prime (Collatz/Syracuse)
I use Mathematica and this one took me just 1.451 seconds.
Mathematica runs out of
its ability for the initial integer of 40.
Edwin Clark wrote:
>On Sun, 1 Feb 2009, Jacques Tramu wrote:
>>So the question is :
>>does any sequence terminates in "1" or with the" 15 23 9 22 15 loop" ?
>>or 25 - ea(25) is 25 33 25
>How about 14? 14->14
>The first number I had trouble with was 18. The problem there is
>eventually it gets to the prime 222312455509 and I have difficulty
>figuring out pi(222312455509).
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