Prime-Counting Function/Examples/10

Definition

The value of the prime-counting ($\pi$) function for $10$ is $4$.


Proof

The prime numbers less than $10$ are:

$2, 3, 5, 7$

Hence:

$\map \pi {10} = 4$

$\blacksquare$


Sources

  • 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): $\map \pi x$
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