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Next Numbers Please #9 (Posted on 20170823) 

What are the next four numbers in the sequence 1, 2, 3, 4, 5, 3, 7, 4, 6, 5, 11, 4, __, __, __, __?
When does the number 12 first appear in the sequence?

Submitted by Brian Smith

Rating: 3.6667 (3 votes)


Solution:

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The next four numbers are 13, 7, 5, 8. These are the Kempner numbers. OEIS A002034
The number 12 first appears as the 243rd term. OEIS A046021 
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