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?

See The Solution Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips re: Direct Basic solution......corrections... | Comment 3 of 6 |
(In reply to Direct Basic solution by Steve Herman)

1.  map the digits 0123456 to 0123689

Should read : map the digits 0123456 to 0125689 (REPLACE 3 BY 5)

The result was not affected

2...."For example, a(x) = 888,888  
This maps to 666666   Should be This maps to 555555 (REPLACE 6 BY 5),..

3. Convert to base 7 giving 16,806 ...  WRONG

YOU should  Convert from base 7 to decimal  getting 14005 etc...

.and get.the answer. x=84035 for a(x)=888,888 (If I  did not err)

Please edit and check your procedures on puzzle's questions (100,1000,888)  to compare with Charlie's results.

 


  Posted by Ady TZIDON on 2014-04-12 09:27:56
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 (1)
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