Remove "Newest Member" from Database

[K2_02]

My board has been getting nailed by spam bots. I installed the mod here at VB.org that checks for how long it takes them to fill out the registration form and that cut down on the bots by about 95%. I have written a CRON job to remove the other 5% by just querying for fields that they enter incorrectly and then removing the user from all appropriate tables.

The problem is that I can't seem to locate where the "Newest Member" is saved in the database. Could someone please point me in the right direction?

Thanks!