Has anyone tried encoding messages using the digits of π?

I recently developed a cipher that encodes messages by utilizing the digits of π (pi) as a unique method! I'd love to hear your thoughts on it or any ideas for improvements. Here's how it works:
- Each character of the text is turned into its ASCII value.
- The ASCII number is found in the digits of π (excluding the decimal point).
- We note where the number first appears and how long that sequence is.
- Each character is then encoded using the format `index-length`, which are separated by hyphens.

For example, the ASCII value for the letter 'A' is 65. If this appears for the first time in the digits of π at index 7 (so, the string of digits will look like 141592653...), it will be encoded as `7-2`.

Here's an encrypted message using my cipher, with the encoding method applied:
```
11-2-153-3-94-3-16867-4-...
```

And I've also included some Python code to decode this message, showing how you can translate back from the encoded format to the original text. Feel free to modify it for your own use!