bool isDivisibleBy8 (uint n)

{
var digits = toDigits(n);
var last3 = digits.getRange (digits.length-3, 3);
uint last = last3.toInt ();
return last%8 == 0;
}

bool is DivisibleBy7(uint n)
{
while ( n > 0) {
var digits = toDigits(n);
var lastDigit = digits.last();
digits.removeAt(digits.Length-1);
n = digits.toInt() - lastDigit*2;
if (n%7 == 0) return true;
}
return false;
}

bool isDivisibleBy6(uint n)
{
return isDivisibleBy2(n) && isDivisibleBy3(n);
}