nohtyP

nohtyP is an esolang invented by User:None1, st is based on Python, but you use small endian numbers instead of big endian ones.

So, 21 in nohtyP actually represents twelve:

>>> 21+1
31

Octal, hexadecimal and binary are the same:

>>> 0b011+0b1
7

That is all you need to know about this language.