home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.puzzles
- Path: sparky!uunet!usc!cs.utexas.edu!convex!convex!joelw
- From: joelw@convex.com (Joel Williamson)
- Subject: Re: New Year's problem
- Sender: usenet@news.eng.convex.com (news access account)
- Message-ID: <1992Dec31.210908.27619@news.eng.convex.com>
- Date: Thu, 31 Dec 1992 21:09:08 GMT
- References: <1htrk2INNrql@mirror.digex.com> <1992Dec31.192849.4576@ll.mit.edu>
- Nntp-Posting-Host: mozart.convex.com
- Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
- X-Disclaimer: This message was written by a user at CONVEX Computer
- Corp. The opinions expressed are those of the user and
- not necessarily those of CONVEX.
- Lines: 37
-
- In article <1992Dec31.192849.4576@ll.mit.edu> mikem@ll.mit.edu writes:
- >In article <1htrk2INNrql@mirror.digex.com> kfl@access.digex.com (Keith F. Lynch) writes:
- >>What property did 1987 have, that no year after it will have until 2013?
- >>
- >>What property did 1961 have, that no year after it will have until 6009?
- >>
- >>Keith Lynch, kfl@access.digex.com
- >
- >Well, 1961 can be turned upside-down and it's still 1961. The same can be
- >said for 6009. But, if you assume a font equivalent to a 7-segment digital
- >display, the same can also be said for 2002. I guess it just depends on
- >your choice of fonts. Many computer fonts display the digit '1' so that
- >it is quite obviously not the same upside-down as right-side-up.
- >
- >
- >for 1987, it seems you're looking for a year in which it's possible to express
- >the date and time using the digits 0-9 exactly once - this first happened in 1987
- >on February 3 at 4:56 AM. 2/3/1987 04:56
- >
- >or, if you don't like leading zeroes, 3/20/1987 4:56.
- >
- >This feat is not possible for subsequent years, since there is always a repeated
- >digit in the year, until you get past 2012.
- >
- >However, even in 2013, with no repeated digits, we have a problem. You have to
- >somehow use the digits 4-9 in a time and date. Try it. You'll quickly see that
- >you can't compose a date and time which use all six digits between 4 and 9.
- >
- >So it seems this isn't *really* a valid answer to the 1987/2013 puzzle. Anyone
- >else care to offer a "better" solution?
-
- Perhaps it's just the simple: 1987 and 2013 have no repeated digits,
- and all years in between do.
-
- Joel Williamson
- --
-
-