perplexus.info :: Sequences : Elementary Math

Elementary Math (Posted on 2013-05-24)

What's the next number in:

4, 21, 143, 1061, 8363, 68906, 586081, ...

See The Solution Submitted by Charlie

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Next are: 5096876, 45086079

It's the number of primes with n digits

A006879

Posted by Benny on 2013-05-24 13:31:15

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