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

[Jonathan Post]

78073 = 101 * 773
so that semiprime is (though njas dislikes the term) a Brilliant Number.
Surely, Eric's discovery's the Concatenation of the Year!

Best,

Jonathan Vos Post


On 7/17/06, Eric W. Weisstein <eric at weisstein.com> wrote:
>
> 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
>
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