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        riddles >> medium >> Sequence
        
(Message started by: karotto on Aug 3^rd, 2014, 11:03am)

Title: Sequence
Post by karotto on Aug 3^rd, 2014, 11:03am

9, 9, 29, 7, 8, 91, 2, 6, 73, 8, 0, 19, 2, 4, ?, 7

Title: Re: Sequence
Post by dudiobugtron on Aug 4^th, 2014, 7:51pm

I notice that [hide]Every third number is somewhat larger than the preceding two, and is also a prime number[/hide]. Perhaps [hide]the prime each time is generated by the two numbers before it[/hide]?

Title: Re: Sequence
Post by pex on Aug 5^th, 2014, 3:02am

I spotted that pattern as well, and nothing else really, except that [hide]91 is not prime[/hide].

Title: Re: Sequence
Post by dudiobugtron on Aug 5^th, 2014, 5:51pm

on 08/05/14 at 03:02:46, pex wrote:

except that [hide]91 is not prime[/hide].

Thanks for spotting that! I'll take this opportunity to express my displeasure at 7 and its presumptuous behaviour as a divisor.