[seqfan] Re: sequence from a test A171371
Jeremy Gardiner
jeremy.gardiner at btinternet.com
Mon Dec 7 07:49:29 CET 2009
Wow, that is a pretty severe mental arithmetic test!
On 7/12/09 05:53, "Alexander Povolotsky" <apovolot at gmail.com> wrote:
so explicit formula appears to be
a(n)= -15/8 * (3-sqrt(17))^n-15/8 * (3+sqrt(17))^n+77/136 * (3+sqrt(17))^n
* sqrt(17)-77/136 * (3-sqrt(17))^n*sqrt(17)
--- On Sun, 12/6/09, N. J. A. Sloane <njas at research.att.com> wrote:
I don't know the pattern to this sequence yet, but it appears on
mental-testing.com.
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