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 Upside down (OEIS A045573) (Posted on 2014-04-11)
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.)
 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

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