The number eleven is the fifth prime number (contrary to popular belief, the number one ( 1 ) is not a prime number).
The base numeric number system lends itself to some interesting peculiarities as relates to the number eleven.
Base 10 for example:
(2 digits) 11 x 11 = 121
(6 digits) 111111 x 111111 = 12345654321
(9 digits) 111111111 x 111111111 = 12345678987654321
Base 16 (hexadecimal) for example:
(2 digits) 11 x 11 = 121
(6 digits) 111111 x 111111 = 12345654321
(9 digits) 111111111 x 111111111 = 12345678987654321
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