text: Sieve of eratosthenes
code: i = 3 ; NEW_LINE while ( i * i <= N ) : NEW_LINE INDENT if ( arr [ i ] ) : NEW_LINE INDENT for j in range ( i * i , N + 1 , i ) : NEW_LINE INDENT arr [ j ] = False ; NEW_LINE DEDENT DEDENT i += 2 ; NEW_LINE DEDENT