a puxxle
Ross La Haye
rlahaye at new.rr.com
Fri Apr 14 22:50:26 CEST 2006
Sorry, forget who mentioned the Roman numeral idea...but consider...
1 I
3 III
8 VIII
18 XVIII
39 XXXIX ...?
89 LXXXIX
189 CLXXXIX
Ross
-----Original Message-----
From: N. J. A. Sloane [mailto:njas at research.att.com]
Sent: Thursday, April 13, 2006 10:00 PM
To: seqfan at ext.jussieu.fr
Cc: njas at research.att.com
Subject: a puxxle
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.
Neil
More information about the SeqFan
mailing list