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The $x/\ln (x)$ approximation yields an estimated count of 3.1 trillion primes below 100 trillion. Compared to the actual count of 3.2 trillion, this is over 99.99% accurate.

Conditions: $x = 100$,000,000,000,000.; The formula used is #primes(x) ~ $x/\ln (x)$.

The $x/\ln (x)$ approximation yields an estimated count of 3.1 trillion primes below 100 trillion. Compared to the actual count of 3.2 trillion, this is over 99.99% accurate.

Conditions: $x = 100$,000,000,000,000.; The formula used is #primes(x) ~ $x/\ln (x)$.