• ← Prime
• → PrimePowerQ

PrimePi

Prime numbers

PrimePi[x]

gives the number of primes less than or equal to x.

PrimePi is the inverse of Prime:

• • PrimePi[2]

• • PrimePi[100]

• • PrimePi[-1]

• • PrimePi[3.5]

• • PrimePi[E]