The next is 22 digits, the next 113=prime(3^3+3) digits, and the next 327=concat(3,3^3)=3*prevprime(113); and the leading six digits of the tower of six 2s are 212003 (21st century), the leading odd prime being 2120038728808211984885164691 (with a perfect number of digits and whose reversal leads with my birth year and has largest prime factor 2493277686417773).

On Sat Feb 12th, 2011 8:52 PM EST James Merickel wrote:

>Leading digits of (first odd prime in) 2^(2^(2^(2^2))).

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