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dec 26 '11 at 6:01
Does iterating $n \to 2n+1$ always eventually produce a prime number?
oct 29 '11 at 4:19
What is the millionth decimal digit of the (10^10^10^10)th prime?
oct 6 '11 at 2:34
Always oddly-many ones in the binary expression for $10^{10^{n}}$?
