home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.puzzles
- Path: sparky!uunet!gatech!paladin.american.edu!howland.reston.ans.net!zaphod.mps.ohio-state.edu!wupost!micro-heart-of-gold.mit.edu!xn.ll.mit.edu!ll.mit.edu!news
- From: mikem@ll.mit.edu
- Subject: Re: New Year's problem
- Message-ID: <1992Dec31.192849.4576@ll.mit.edu>
- Sender: mikem@ll.mit.edu
- Organization: MIT Lincoln Laboratory
- References: <1htrk2INNrql@mirror.digex.com>
- Date: Thu, 31 Dec 92 19:28:49 GMT
- Lines: 35
-
- 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?
-
- -------------------------------------------------------------------------------
- Michael Maciolek - mikem@ll.mit.edu --- VOICE (617)981-3174 - FAX (617)981-0189
- Network Engineer - MIT Lincoln Laboratory - Computer Telecommunications Systems
- -------------------------------------------------------------------------------
- "It works fine, provided you _want_ things to explode upon arrival."
-