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A175185 Pisano period length of the 6-Fibonacci numbers A005668. 10
1, 2, 2, 4, 20, 2, 16, 8, 6, 20, 24, 4, 6, 16, 20, 16, 36, 6, 8, 20, 16, 24, 48, 8, 100, 6, 18, 16, 60, 20, 30, 32, 24, 36, 80, 12, 12, 8, 6, 40, 40, 16, 42, 24, 60, 48, 96, 16, 112, 100, 36, 12, 26, 18, 120, 16, 8, 60, 40, 20, 124, 30, 48, 64, 60, 24, 22, 36, 48, 80, 70, 24, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Period length of the sequence defined by reading A005668 modulo n.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

S. Falcon, A. Plaza, k-Fibonacci sequences modulo m, Chaos, Solit. Fractals 41 (2009) 497-504.

MAPLE

F := proc(k, n) option remember; if n <= 1 then n; else k*procname(k, n-1)+procname(k, n-2) ; end if; end proc:

Pper := proc(k, m) local cha, zer, n, fmodm ; cha := [] ; zer := [] ; for n from 0 do fmodm := F(k, n) mod m ; cha := [op(cha), fmodm] ; if fmodm = 0 then zer := [op(zer), n] ; end if; if nops(zer) = 5 then break; end if; end do ; if [op(1..zer[2], cha) ] = [ op(zer[2]+1..zer[3], cha) ] and [op(1..zer[2], cha)] = [ op(zer[3]+1..zer[4], cha) ] and [op(1..zer[2], cha)] = [ op(zer[4]+1..zer[5], cha) ] then return zer[2] ; elif [op(1..zer[3], cha) ] = [ op(zer[3]+1..zer[5], cha) ] then return zer[3] ; else return zer[5] ; end if; end proc:

k := 6 ; seq( Pper(k, m), m=1..80) ;

MATHEMATICA

Table[s = t = Mod[{0, 1}, n]; cnt = 1; While[tmp = Mod[6*t[[2]] + t[[1]], n]; t[[1]] = t[[2]]; t[[2]] = tmp; s!= t, cnt++]; cnt, {n, 100}] (* Vincenzo Librandi, Dec 20 2012 - after T. D. Noe *)

CROSSREFS

Cf. A001175, A175181 - A175184.

Sequence in context: A052628 A006853 A120417 * A257610 A062267 A128501

Adjacent sequences:  A175182 A175183 A175184 * A175186 A175187 A175188

KEYWORD

nonn,easy

AUTHOR

R. J. Mathar, Mar 01 2010

STATUS

approved

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Last modified March 25 15:14 EDT 2017. Contains 284082 sequences.