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 .
prime = [ True for i in range ( MAX + 1 ) ] NEW_LINE def SieveOfErastosthenes ( ) : NEW_LINE INDENT prime [ 1 ] = False NEW_LINE for p in range ( 2 , mt . ceil ( mt . sqrt ( MAX ) ) ) : NEW_LINE DEDENT