bc -l <<<'scale=500;e(1)'

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gievs the first 500 digits fast (you might need to recompile bc if it's compiled with a too small max precision). I've tried with 
bc -l <<<'scale=500;e(1)' | tr -dc 0-9 | ruby -we 's = gets; (0...(s.l
+ength-10)).each {|k| puts s[k,10];};' | factor | grep -v ' .* '

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and found that there are about 17 10-digit primes in the first 500 digits.

In reply to Re: Caclulation of e by ambrus
in thread Caclulation of e by doc

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