Create a boolean array " prime [ 0 . . n ] " and initialize all entries it as true . A value in prime [ i ] will finally be false if i is Not a prime , else true .
def SieveOfEratosthenes ( ) : NEW_LINE INDENT global prime NEW_LINE for p in range ( 2 , int ( math . sqrt ( mxn ) ) + 1 ) : NEW_LINE DEDENT