Description: 2003 $2 Bill Low Serial Number I05000042A 98.0% Great Rating Coolness Index Powered by CoolNumbers.com What makes this serial number special (or not)? 05000042's digits sum to 11. In 0.076% of 8-digit numbers, the digits sum to at most 11. 05000042 contains a 5-of-a-kind. Only 0.43% of 8-digit numbers have this combination. 05000042 contains a 4-of-a-kind together. Only 0.46% of 8-digit numbers have this combination. 05000042 has 4 unique digits. In 9.3% of 8-digit numbers, there are 4 or fewer unique digits.