// reversed returns a new *big.Int with reversed digits.
func reversed(n *big.Int) *big.Int {
a := n.String()
b := tools.ReversedString(a)
c, _ := new(big.Int).SetString(b, 10)
return c
}
// isPalindrome checks whether the given *big.Int is a palindrome.
func isPalindrome(n *big.Int) bool {
a := n.String()
b := tools.ReversedString(a)
return a == b
}