2 dollar bills have the same number but the last number. And the 20$ has the same number forward and backwards
The $20 has consecutive 4-digit numbers, but I don't know what it might be called. Anyone know? Chris
I'm not sure what they are called. I found a $1 that had the same kind of numbers awhile back that I kept.
Your $1 note are consecutive #, quite common because they are new issue 2017 notes. On the $20 if the 2 was a 3 it would be a Bookend Note. Interesting numbers. First four numbers are sequential to the second four.
On the 20, if the 2 was a 3 this note would be a repeated, a radar, and a binary. Close but no cigar.