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The Liber Abaci or Liber Abbaci [1] (Latin for "The Book of Calculation") was a 1202 Latin work on arithmetic by Leonardo of Pisa, posthumously known as Fibonacci. It is primarily famous for introducing both base-10 positional notation and the symbols known as Arabic numerals in Europe.
For Fibonacci numbers starting with F 1 = 0 and F 2 = 1 and with each succeeding Fibonacci number being the sum of the preceding two, one can generate a sequence of Pythagorean triples starting from (a 3, b 3, c 3) = (4, 3, 5) via
The first 20 Fibonacci numbers F n are: F 0 F 1 F 2 F 3 F 4 F 5 F 6 F 7 F 8 F 9 F ... empty sequence "adds up" to 0. ... of k twos from n−k−1 terms. Use of the ...
The Book of Squares, (Liber Quadratorum in the original Latin) is a book on algebra by Leonardo Fibonacci, published in 1225. [1] It was dedicated to Frederick II, Holy Roman Emperor. [2] After being brought to Pisa by Master Dominick to the feet of your celestial majesty, most glorious prince, Lord F.,
Thus it suffices to compute Pisano periods for prime powers =. (Usually, () = (), unless p is k-Wall–Sun–Sun prime, or k-Fibonacci–Wieferich prime, that is, p 2 divides F k (p − 1) or F k (p + 1), where F k is the k-Fibonacci sequence, for example, 241 is a 3-Wall–Sun–Sun prime, since 241 2 divides F 3 (242).)
A famous example is the recurrence for the Fibonacci numbers, = + where the order is two and the linear function merely adds the two previous terms. This example is a linear recurrence with constant coefficients , because the coefficients of the linear function (1 and 1) are constants that do not depend on n . {\displaystyle n.}
The semi-Fibonacci sequence (sequence A030067 in the OEIS) is defined via the same recursion for odd-indexed terms (+) = + and () =, but for even indices () = (), . The bisection A030068 of odd-indexed terms s ( n ) = a ( 2 n − 1 ) {\displaystyle s(n)=a(2n-1)} therefore verifies s ( n + 1 ) = s ( n ) + a ( n ) {\displaystyle s(n+1)=s(n)+a(n ...
then F(n,k) is the number of ways an n−1 by 1 rectangle can be tiled with 2 by 1 dominoes and 1 by 1 squares so that exactly k squares are used. [1] Equivalently, F(n,k) is the number of ways of writing n−1 as an ordered sum involving only 1 and 2, so that 1 is used exactly k times. For example F(6,3)=4 and 5 can be written in 4 ways, 1+1+1 ...