Search: id:A133246
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%I A133246
%S A133246 9,17,19,23,27,31,45,51,53,57,61,63,69,79,81,83,85,93,95,99,107,109,115,
%T A133246 117,119,133,135,137,153,155,159,161,167,171,173,181,183,187,189,197,
%U A133246 207,209,211,217,221,225,227,229,237,241,243,247,249,253,255,257,261
%N A133246 Odd numbers n with property that no odd Fibonacci number is divisible 
               by n.
%C A133246 The Mathematica coding uses the fact that the Pisano period - the period 
               with which a Fibonacci sequence (mod n) repeats itself is not more 
               than 6n and the fact that the Fibonacci sequence starts with 0.
%t A133246 Transpose[ Select[Table[{k, Select[Table[{n, Mod[Fibonacci[n], k]}, {n, 
               6k + 1}], Mod[ #[[1]], 3] != 0 && #[[2]] == 0 &]}, {k, 1, 351, 2}], 
               #[[2]] == {} &]][[1]]
%Y A133246 Cf. A133247.
%Y A133246 Sequence in context: A004751 A134104 A124966 this_sequence A144752 A073160 
               A143850
%Y A133246 Adjacent sequences: A133243 A133244 A133245 this_sequence A133247 A133248 
               A133249
%K A133246 nonn
%O A133246 1,1
%A A133246 Tanya Khovanova (tanyakh(AT)yahoo.com), Oct 14 2007, Oct 17 2007

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