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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    
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re(2): Direct Basic solution......corrections... Comment 6 of 6 |
(In reply to re: Direct Basic solution......corrections... by Ady TZIDON)

Well, that's what I get for showing off.  I guess I should have used my procedure with Charlie's known answers.  Or checked my work.  Or both.
  Posted by Steve Herman on 2014-04-12 11:41:15

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