11 is one more than ten and one less than 12. Other meanings, such as being a lucky or unlucky number, may be based on various dogmas of superstitions, religions, or cultures.
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By the Numbers was created on 2008-11-11.
Numbers are unique and so the decimal number 11 is 11 and no second number.
1 and 11.
1 and 11.
3, 7 and 11 are prime numbers.