roughbarked said:

Michael V said:

Michael V said:

I got into the billions, and still have not struck these letters off the list.

A C J K P Q Z

Arrrgh. Should read:

A C J K P Q

The question asks, upwards of zero. Ths doessn’t imply as such that zero should be included or does it?

I interpret the question to mean the first number in the list must be 0, but I guess it might be considered ambiguous.