a puxxle

[Robert G. Wilson v]

Everyone,

	I find it difficult to believe that a order three recursion
is what the 'feds' were after. Might I suggest that what they wanted
was A079583: a(0)=1 a(n)=2*a(n-1)+n.

Bob.


Floor en Lyanne van Lamoen wrote:

> Dear all,
> 
> 
>>>:%S A117713 1,3,8,18,__,89,189
>>>:%N A117713 This sequence was a question on a civil service test a friend
>>
>>of
>>
>>>mine took. They had to fill in the blank number. Is there an answer to
>>
>>this??.
> 
> 
> For our amusement the following recursion:
> 
> u(n) = 18.5u(n-1)-11u(n-2)-53.5u(n-3)-43.5 gives the above sequence, with 41
> as the number to fill in. 
> When the sequence is extended, 189 is the last integer.
> 
> Kind regards,
> Floor.
> 
>