a puxxle

[Graeme McRae]

Something to do with Roman Numerals, perhaps?

----- Original Message ----- 
From: "Jud McCranie" <j.mccranie at adelphia.net>
To: <njas at research.att.com>
Cc: <seqfan at ext.jussieu.fr>; <njas at research.att.com>
Sent: Thursday, April 13, 2006 10:06 PM
Subject: Re: a puxxle


> At 11:00 PM 4/13/2006, N. J. A. Sloane wrote:
>>Dear Seqfans:
>>Someone just sent this in.  I gave it an A-number.  But I can't
>>add it to the OEIS until the missing term is filled in. Any ideas?
>>The differences are suggestive
>>
>>%I A117713
>>%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??.
>>%O A117713 0,2
>>%K A117713 nonn
>>%A A117713 Louis Ciotti (lciotti(AT)twcny.rr.com), Apr 13 2006
>>
>>Differences: 2 5 10 a b 100 , but a+b = 71, which is ugly.
>
> Yes, it seems more likely that the differences would be 2, 5,10, 20, 50, 
> 100, but that doesn't fit.
>
>
>