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neves dda tsuj (Posted on 2004-02-22) Difficulty: 3 of 5
You have a simple (base-ten, whole number) calculator which can perform only two operations: visually reversing a number, and adding seven.

Prove that you can use this calcluator to convert any number to 1.

Notation: use ~ to denote reversal, as in
~53 = 35

No Solution Yet Submitted by DJ    
Rating: 4.5000 (6 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
programming solutionAxorion2004-02-29 13:09:06
re(2): Straightforward , but not soRichard2004-02-24 11:44:04
Some Thoughtsre: Straightforward , but not so "executable" SolutionAdy TZIDON2004-02-24 11:35:50
SolutionStraightforward SolutionRichard2004-02-23 20:41:28
Solutionre(2): --a slight complication IS RESOLVEDAdy TZIDON2004-02-23 09:18:03
No SubjectPenny2004-02-23 02:11:20
re: my solution revisited and revised --a slight complicationTomM2004-02-22 23:52:00
my solution revisited and revisedAdy TZIDON2004-02-22 22:40:02
Hints/Tipsremarks: Not the most rigorous proof, but....Ady TZIDON2004-02-22 21:51:51
Solutionmy solutionAdy TZIDON2004-02-22 17:49:31
SolutionNot the most rigorous proof, but....Penny2004-02-22 15:04:25
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