Wouldn't c8g.12xlarge with 500g storage (only EBS is possible), plus 1gbps from/to the internet is 5,700 USD per month, that's some discount you have.

If I try to match the actual machine. 16G ram. A rough estimate is that their Xeon E3-1240 would be ~2 AWS vCPU. So an r6g.large is the instance that would roughly match this one. Add 500G disk + 1 Gbps to/from the internet and ... monthly cost 3,700 USD.

Without any disk and without any data transfer (which would be unusable) it's still ~80USD. Maybe you could create a bootable image that calculates primes.

These are still not the same thing, I get it, but ... it's safe to say you cannot get anything remotely comparable on AWS. You can only get a different thing for way more money.

(made estimates on https://calculator.aws/ )