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+--- Thread: Primes and Tetration link - Bertrand's postulate (/showthread.php?tid=455)
Primes and Tetration link - Bertrand's postulate - deepblue - 06/11/2010
Just stumbled with this:
"Bertrand's postulate implies that there are infinitely many numbers a for which floor(2^a), floor(2^2^a), floor(2^2^2^a), ... are all prime. The smallest of these is a = 1.25164 75977 90463 01759 44320 53623... and generates the Bertrand primes: 2, 5, 37, 137438953481, .... The next Bertrand prime has 41,373,247,571 digits. [Caldwell]"
Source: http://primes.utm.edu/curios/page.php/137438953481.html
deep links around?