Applying findivisor.go to calculate the result

main.go

func main() {
	c := 1
	for {
		tn := c * (c + 1) / 2
		div := numbertheory.FindDivisor(tn)
		if len(div) > 500 {
			fmt.Println(tn)
			break
		}
		c++
	}
}