Additive primes: Difference between revisions

=={{header|Dart}}==

<syntaxhighlight lang="dart">import 'dart:math';

void main() {

const limit = 500;

print('Additive primes less than $limit :');

int count = 0;

for (int n = 1; n < limit; ++n) {

if (isPrime(digit_sum(n)) && isPrime(n)) {

print(' $n');

++count;

}

}

print('$count additive primes found.');

}

bool isPrime(int n) {

if (n <= 1) return false;

if (n == 2) return true;

for (int i = 2; i <= sqrt(n); ++i) {

if (n % i == 0) return false;

}

return true;

}

int digit_sum(int n) {

int sum = 0;

for (int m = n; m > 0; m ~/= 10) sum += m % 10;

return sum;

}</syntaxhighlight>