禣猧计緇

碝т计筁祘琌羮エт计或妓氮琌рウだ秆 

だ秆计獽玻ネ緇 (Cofactor)硂ぃ阶宾此计 (Mersenne Number) 禣皑计 (Fermat Number) ┪瞷ざ残禣猧计 (Fibonacci Number) いΤ﹚╯基

┮孔禣猧计獽琌パそΑ玻ネ计

F1 = F2 = 1Fn+2 = Fn+1 + Fn (ㄤい n = 1,2,3,...)

и Fn 琌 Fnm 

だ秆禣猧计の讽い禣猧緇 (Fibonacci Cofactor)

n 禣猧计 Fn 禣猧緇
6 8 23
8 21 3 X 7
9 34 2 X 17
10 55 5 X 11
12 144 22 X 32
14 377 13 X 29
15 610 2 X 5 X 61
16 987 3 X 7 X 47
18 2584 23 X 17 X 19
19 4181 37 X 113

爹︹禣猧緇堵︹禣猧计┪瞷緇

把σゅ膍の呼

Caldwell, C. K. "The Top Twenty: Fibonacci Cofactor." http://primes.utm.edu/top20/page.php?id=64.