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

franktaw at franktaw at
Mon Jul 24 23:23:40 CEST 2006

No, no, no.  Of course you want to look in base e.  For any initial 
sequence, there is only one integer which has that as the part before 
the "decimal" point in base e: just take the ceiling.  So, for example, 
101 = e^2+1 = 8.389... represents the number 9.

Franklin T. Adams-Watters

-----Original Message-----
From: Jonathan Post <jvospost3 at>

I am somewhat serious about pi base e.  So far as I can see, pi base e 
= 10.101002020002111120020101120... as per A050948Pi expressed in base 
1/e: Pi = Sum a(i)*exp(-i), i=-1,0,1,...
Now, in what base should we examine substrings of this for primality?  
In the unnatural base 10, ...

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