rename directory

12_highly_divisible_triangular_number/main.go

@@ -0,0 +1,53 @@
+package main
+
+import "fmt"
+
+func main() {
+	n := 1
+	d := 1
+	for Tau(d) <= 500 {
+		n++
+		d += n
+	}
+
+	fmt.Println("num is", d, n)
+}
+
+func Tau(num int) int {
+	if num == 1 {
+		return 1
+	}
+	n := num
+	i := 2
+	p := 1
+
+	for i*i < n {
+		c := 1
+		for n%i == 0 {
+			n /= i
+			c++
+		}
+		i++
+		p *= c
+	}
+
+	if n == num || n > 1 {
+		p *= 1 + 1
+	}
+
+	return p
+}
+
+func GetTriangularNumber(n int) int {
+	return n * (n + 1) / 2
+}
+
+func ListDivisors(input int) []int {
+	var ret []int
+	for i := 1; i <= input; i++ {
+		if input%i == 0 {
+			ret = append(ret, i)
+		}
+	}
+	return ret
+}