f.ardelian
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 Dec 17 awarded Good Question Aug 18 awarded Famous Question Mar 24 awarded Yearling Nov 19 awarded Notable Question Aug 7 awarded Popular Question Apr 24 awarded Editor Apr 24 revised How many prime numbers are known? Added video on density of primes Feb 7 awarded Nice Question Jan 9 comment How many prime numbers are known? @PavelM I don't get your point. Jan 9 comment How many prime numbers are known? @MattE Are you sure? According to WolframAlpha, $\log(2^{43,112,609}) \approx 2.988*10^{7}$ wolframalpha.com/input/?i=log%282%5E43%2C112%2C584-1%29 Jan 9 answered How many prime numbers are known? Jan 9 comment How many prime numbers are known? (2) Here's another way to look at it: how many known odd positive numbers are smaller than Graham's number? The answer to that would be (g64+1)/2. They can't be listed but we have a relatively simple way of expressing how many they are. Jan 9 comment How many prime numbers are known? (1) "If I generate a dozen hundred-digit primes and they are forgotten after I close the window showing them, are these primes still "known"?" Now you're getting too philosophical, but look at it this way: if you record somewhere the smallest and the largest prime you came across and the number of primes between them, then the desirable answer to your question that would also fit my question would be "yes" because I am interested in their number. Jan 8 comment How many prime numbers are known? @nbubis: I asked about known primes. Jan 8 awarded Student Jan 8 asked How many prime numbers are known?