[seqfan] Re: Rank of a prime (Collatz/Syracuse)

Edwin Clark eclark at math.usf.edu
Sun Feb 1 04:58:03 CET 2009


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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