Straih Fibonacci

Leacan jeant jeh kerrinyn, as ya lhiurid ny çheuyn oc rere ny h-earrooyn Fibonacci

Caslagh Fibonacci jeant liorish kerrinyn ayns leacan Fibonacci, as cruillagyn jeant eddyr ny corneilyn oc. Ta'n fer shoh jeant jeh kerrinyn 1, 1, 2, 3, 5, 8, 13, 21, as 34 er lhiurid.

Ayns maddaght, ta ny earrooyn Fibonacci ny straih Fibonacci çheet er earrooyn yn 'traih shoh:

$0,1,1,2,3,5,8,13,21,34,55,89,144,\dots .$

Rere meenaghey, she 0 as 1 ad y chied daa earroo Fibonacci, as ta dagh earroo ny yei ny sym y daa roish. Ny keayrtyn, t'ad faagail magh y 0 as goaill toshiaght lesh 1, 1.

Rere maddaght, ta'n straih F_n dy earrooyn Fibonacci rere'n cochiangley aahaghyrtagh

$F_n=F_{n-1}+F_{n-2},$

as ny earrooyn toshee heese echey

$F_0=0\text{and}{F}_1=1.$

Ta ennym yn 'traih çheet er Leonardo jeh Pisa. V'ad cur Fibonacci er (girraghey er son filius Bonaccio, "mac Vonaccio"). Ren y lioar 1202 echey, Liber Abaci, cur stiagh y striah dys maddaght ny h-Oarpey Heear. V'eh mie er fys ayns maddaght Injinagh hannah.