primes in pi: 1, 2, 6, 38, 16208, 47577, 78073, ...

[Eric W. Weisstein]

Anyone curious about prime number searches may be (slightly) interested to 
learn that the concatenation of the first 78073 digits of pi (including 
the initial 3) forms a probable prime.  For the complete list of known 
indices of primes in the digits of pi (as listed above), see 
http://www.research.att.com/~njas/sequences/A060421.

I believe at 78073 digits, pi(78073) becomes the 65th largest known PRP 
(cf. http://www.primenumbers.net/prptop/prptop.php).

Cheers,
-Eric