perplexus.info :: Numbers : Upside down (OEIS A045573)

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 a_n= 888, what is n?

See The Solution Submitted by Ady TZIDON

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re(2): Direct Basic solution

| Comment 5 of 6 |

(In reply to re: Direct Basic solution by Charlie)

I know that your solution is ok.

I just did not check my own results to be absolutely sure,

Posted by Ady TZIDON on 2014-04-12 11:29:07

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