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Tuesday, October 11, 2011

Happy Binary Day !

Happy Binary Day !
10/11/11 That's 47 in Decimal.
Forty-seven is the fifteenth prime number, a safe prime, the thirteenth supersingular prime, and the sixth Lucas prime. Forty-seven is a highly cototient number. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
It is a Lucas number.
It is also a Keith number, because it recurs in a Fibonacci-like sequence that begins 2, 1, 3, 4, 7, 11, 18, 29, 47…. Notice that its digits appear as successive terms in the series.
Forty-seven is a strictly non-palindromic number.
Its representation in binary being 00101111, 47 is a prime Thabit number, and as such is related to the pair of amicable numbers {17296, 18416}.
Forty-seven is a Carol number. It is a real prime number.

Yeah, I didn't understand any of that either.

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