Sum of the digits of the number 2^1000 [closed]

Answer 1

something like that sould do it bute force: - although there is a nice analytic solution (think pen& paper) using mathematics - that may also work for numbers greater than 1000.

    final String bignumber = BigInteger.valueOf(2).pow(1000).toString(10);
    long result = 0;
    for (int i = 0; i < bignumber.length(); i++) {
        result += Integer.valueOf(String.valueOf(bignumber.charAt(i)));
    }
    System.out.println("result: " + result);