[seqfan] Re: Puzzle Sequence

Farideh Firoozbakht f.firoozbakht at sci.ui.ac.ir
Fri Jun 19 10:34:34 CEST 2009


Can you explain the furmula of f(n)=a(n+1)/a(n)?

As you found f(n), for n = 1, 2, ..., 7 are :

2, 5, 5, 37, 397, 12377, 1605385, ?

Quoting franktaw at netscape.net:

> 9090287650,14593411438995250
>
> Note that this last ratio is not prime.
>
> Franklin T. Adams-Watters
>
> -----Original Message-----
> From: David Wilson <davidwwilson at comcast.net>
>
> 1,2,10,50,1850,734450,?
>
>
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