func main() {
for i := uint64(724709891); i < 729927007; i += 100000 {
if mathutil.IsPrimeUint64(i) && IsPrimitive(10, i) {
fmt.Println((i - 1) * 9 / 2)
}
}
}
func main() {
ary := Uint64s{7, 6, 5, 4, 3, 2, 1}
var num uint64
for mathutil.PermutationNext(ary) {
num = 0
for _, v := range ary {
num = 10*num + v
}
if mathutil.IsPrimeUint64(num) {
fmt.Println(num)
break
}
}
}