Even and odd letters: ACEGIKMOQSUWY and BDFHJLNPRTVXZ

1, 2, 3, 4, 5, 6, 7… How about counting using odd numbers 1, 3, 5, 7, 9… I bet you can can count using even numbers. 2, 4, 6, 8, 10, etc.

But what about reciting all the odd letters of the alphabet?

ACEGIKMOQSUWY

Or naming all the even letters in order?

BDFHJLNPRTVXZ

It’s pretty hard to do.

Surprisingly, there is very little information online or in books about even and odd letters. Most instances of ACEGIKMOQSUWY are people using it as a username.

This sort of intersection of two systems.