/* *Print out all palindrome and prime numbers between 1 and 100. Use any language you want. 1. Palindrome definition: a word, phrase, or sequence that reads the same backwards as forwards 2. Prime number definition: a whole number greater than 1 that cannot be exactly divided by any whole number other than itself and 1 (e.g. 2, 3, 5, 7, 11). */

main.dart

/*
 *Print out all palindrome and prime numbers between 1 and 100. Use any language you want.
1. Palindrome definition: a word, phrase, or sequence that reads the same backwards as forwards
2. Prime number definition: a whole number greater than 1 that cannot be exactly divided by any whole number other than itself and 1 (e.g. 2, 3, 5, 7, 11).
 */

void main() {
  // create numbers list from 1 to 100
  List<int> numbers = List.generate(100, (int index) => index + 1);
  // print(numbers);

  // iterate the list
  for (int i = 0; i < numbers.length; i++) {
    // check of its a prime number to reduce time
    if (isPrime(numbers[i])) {
      // then check for if the number is a palindrome
      // algorithm is reversing and check if they are the same
      int? palindrome = isPalindrome(numbers[i]);
      if (palindrome != null) {
        print(palindrome);
      }
    }
  }
}

int? isPalindrome(int number) {
  String numberToString = number.toString();
  List<String> numberToList = numberToString.split('').toList();

  if (numberToList.reversed.join('') == numberToString) {
    return int.parse(numberToString);
  } else {
    return null;
  }
}

bool isPrime(int number) {
  if (number < 2) {
    return false;
  }
  for (int i = 2; i <= number / 2; i++) {
    if (number % i == 0) {
      return false;
    }
  }
  return true;
}