PrimePi

PrimePi(x)

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

See

• Wikipedia - Prime-counting function
• Wikipedia - On the Number of Primes Less Than a Given Magnitude
• Fungrim - Prime numbers

Examples

>> PrimePi(100)
25

>> PrimePi(-1)
0

>> PrimePi(3.5)
2

>> PrimePi(E)
1

Implementation status

• ☑ - partially implemented

Github

• Implementation of PrimePi