All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers
Upside down (OEIS A045573) (Posted on 2014-04-11) Difficulty: 3 of 5
Some numbers remain numbers when turned upside down (using digits 0125689, with no final 0's): 1, 2, 5, 6, 8, 9, 11, 12, etc

IF a1=1, a2=2, a3=5,... a8=12,, etc

a.Evaluate a100
b. Evaluate a1000
c. If an= 888, what is n?

  Submitted by Ady TZIDON    
No Rating
Solution: (Hide)
a. 226
b. 5286
c. 245

To evaluate a(n):
i. Let b=int(n/6); c=n mod 6
ii. convert b to base 7, then append c & call the result e.
iii. In e map the digits 3,4,5,6 to 5,6,8,9; 0,1,2 stay unchanged.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(2): Direct Basic solution......corrections...Steve Herman2014-04-12 11:41:15
Some Thoughtsre(2): Direct Basic solutionAdy TZIDON2014-04-12 11:29:07
re: Direct Basic solutionCharlie2014-04-12 09:35:09
Hints/Tipsre: Direct Basic solution......corrections...Ady TZIDON2014-04-12 09:27:56
Direct Basic solutionSteve Herman2014-04-11 21:06:06
Solutioncomputer solutionCharlie2014-04-11 15:47:31
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information