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A205781 Least positive integer j such that n divides C(k)-C(j), where k, as in A205780, is the least number for which there is such a j, and C=A007598 (squared Fibonacci numbers). 0

%I #6 Dec 04 2016 19:46:26

%S 1,1,1,1,2,1,2,1,1,2,3,1,4,1,2,3,6,4,2,2,2,1,2,1,4,4,3,1,5,2,3,3,2,6,

%T 5,4,3,7,4,3,8,1,3,1,1,3,6,4,3,4,6,4,2,3,3,1,2,3,3,2,12,4,1,2,7,1,2,6,

%U 10,6,2,4,2,16,4,7,1,5,4,3,5,6,11,1,7,3,4,1,8,1,5,3,4,4,3,2,5

%N Least positive integer j such that n divides C(k)-C(j), where k, as in A205780, is the least number for which there is such a j, and C=A007598 (squared Fibonacci numbers).

%C For a guide to related sequences, see A204892.

%e 1 divides C(2)-C(1) -> k=2, j=1

%e 2 divides C(3)-C(1) -> k=3, j=1

%e 3 divides C(2)-C(1) -> k=2, j=1

%e 4 divides C(3)-C(1) -> k=3, j=1

%e 5 divides C(3)-C(2) -> k=3, j=2

%t s = Table[(Fibonacci[n + 1])^2, {n, 1, 120}];

%t lk = Table[

%t NestWhile[# + 1 &, 1,

%t Min[Table[Mod[s[[#]] - s[[j]], z], {j, 1, # - 1}]] =!= 0 &], {z, 1,

%t Length[s]}]

%t Table[NestWhile[# + 1 &, 1,

%t Mod[s[[lk[[j]]]] - s[[#]], j] =!= 0 &], {j, 1, Length[lk]}]

%t (* _Peter J. C. Moses_, Jan 27 2012 *)

%Y Cf. A204892, A007598.

%K nonn

%O 1,5

%A _Clark Kimberling_, Feb 01 2012

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Last modified April 24 17:51 EDT 2024. Contains 371962 sequences. (Running on oeis4.)