Do you know what a "peanut" code is on a glass bottle?

Question

http://img.geocaching.com/cache/log/19e54b25-249d-4340-915f-8087c3d0d827.jpg

BOTTLE SECRETS

Every glass bottle has a "peanut" at the bottom. The peanut is an embossed code. E.G. 31, 8, 41.

What does the image above mean?

Answer 1

1. 44 = 32 + 8 + 4

2. 49 = 32 + 16 + 1

5. 93 = 64 + 16 + 8 + 4 + 1

6. 36 = 32 + 4