# Series of exponential prime reciprocals

1. Feb 27, 2012

### YvesSch

Sum of reciprocal of some base (I just chose e as example) to prime power?

Ʃ $\frac{1}{e^{p}}$ = $\frac{1}{e^2}$+$\frac{1}{e^3}$+$\frac{1}{e^5}$+$\frac{1}{e^7}$+$\frac{1}{e^{11}}$+$\frac{1}{e^{13}}$+$\frac{1}{e^{17}}$+...
p$\in$P

Brute force simulation gives me
~0.19279118970439518
Is there an elementary, non-transient solution?

2. Feb 29, 2012

### Norwegian

If you replace e by 2, you get what some people call the prime constant. It encodes all the primes, but as far as I can tell, no other interesting relations involving this number has been found. Also, it may still be open whether this number is algebraic or transcendental.