ChatGPT and Claude can't code a complex algorithm

I asked ChatGPT for an algorithm, then asked it to code it up. It produced incorrect code that didn't implement its algorithm. Claude was not able to fix it either.

You can read the short chats here:

https://chatgpt.com/share/68d01a2c-e9d8-800b-b4fd-99908515e5...

and here:

https://claude.ai/share/07a9e274-f876-41dd-bb3b-9197474a6204

All versions of the code are incorrect (the sequence "12" occurs at the 148th digit of pi but all versions skip it without finding it.)