public static PerformOperation is_odd() {

    return (int a) -> {
        return ((a & 1) == 1);
    };

}

public static PerformOperation is_prime() {
    return (int a) -> {
        if (a < 2) return false;
        for (int i = 2; i * i <= a; i++)
            if (a % i == 0) return false;
        return true;
    };

}

public static PerformOperation is_palindrome() {
    return  (int a) -> {
       String str = Integer.toString(a);
       String str2 = "";
       int i = 0;
       int j = str.length() - 1;
       for ( ; i <= j; ++i, --j) {
           if (str.charAt(i) != str.charAt(j)) return false; 
       }
       return true;
    };
}