Add code for Sieve of Eratosthenes

Math/sieve_of_eratosthenes.py

@@ -0,0 +1,14 @@
+def sieve_of_eratosthenes(n):
+    prime = [True for _ in range(n + 1)]
+    p = 2
+    while p * p <= n:
+        if prime[p]:
+            for i in range(p * p, n + 1, p):
+                prime[i] = False
+        p += 1
+    primes = [p for p in range(2, n + 1) if prime[p]]
+    return primes
+
+
+n = int(input("Enter the number up to which you want to find primes: "))
+print("Prime numbers up to", n, "are:", *sieve_of_eratosthenes(n))