A214795 - OEIS

%I #16 Nov 25 2017 09:58:50

%S 2,2,5,5,10,5,9,5,17,12,2,5,6,9,13,17,8,17,11,53,9,2,4,5,30,6,45,17,7,

%T 33,23,41,13,8,33,17,47,11,21,53,29,9,53,23,93,33,25,17,65,30,29,23,

%U 42,45,10,17,29,21,51,53

%N a(n) is the smallest k>=2 such that n divides Fibonacci(k-1)+21.

%C The n-th entry a(n) means that a(n) is the index of the first term in A000045+21 which n divides.

%t skdf[n_]:=Module[{k=2},While[!Divisible[Fibonacci[k-1]+21,n],k++];k]; Array[ skdf,60] (* _Harvey P. Dale_, Nov 25 2017 *)

%Y Cf. A214789, A213790, A214791, A214792

%K nonn

%O 1,1

%A _Art DuPre_, Aug 03 2012

%E Definition corrected. - _R. J. Mathar_, Aug 09 2012