Add phi approximation in Go

go/approximate_phi.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+  "fmt"
+)
+
+func main() {
+  fmt.Println(phi(1000)) // number of iterations
+}
+
+func phi(args... float64) float64 { if  iters := args[0]; iters > 0 { return func() float64 { if len(args) == 1 { return phi(iters - 1, 1 + 1.0 / 1)} else {return phi(iters - 1, 1 + 1.0 / args[1])} }()} else { return args[1]}}