This is from Eric Weisstein ... Date: Mon, 17 Jul 2006 08:42:54 -0500 (CDT) From: "Eric W. Weisstein" <eric@weisstein.com> X-X-Sender: eww@wopr.wolfram.com To: Sequence Fans Mailing List <seqfan@ext.jussieu.fr> cc: Math-Fun mailing list <math-fun@CS.Arizona.EDU> Subject: primes in pi: 1, 2, 6, 38, 16208, 47577, 78073, ... 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 --------- I saw the buried cable problem in one of Gardner's puzzle columns, long long ago. I've always been curious if the solver is required to cleanup his patch cord. Rich