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Visa begins with 4 16 digits Master " " 5 " Discover " " 6 " Amex " " 3 15 digits
the first for numbers of a credit card is well... the first 4 numbers for ex. 0000 0000 0000 0000 the first 4 ... its simple
The first composite number is 4.
2,3,5,7
3.1415