Why Oracle JDK 13 is available but not corretto 13 from AWS?
https://docs.aws.amazon.com/corretto/ - Shows version 11 and then 17.
Is there any way to get this?
JDK 13 was a Short Term Support release (STS) that was only supported for a few months. It is available from Oracle download archive. There is absolutely no reason why anyone should try to use end of life STS releases other than the current one, if you are experimenting with bleeding edge features. JDK 11, 17 and 21 are Long Term Support releases that are supported for a longer period of time and which are strongly recommended to use.