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The index values of the smallest and the largest n-digit Fibonacci numbers.
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%I #9 Jun 04 2018 16:30:12

%S 0,6,7,11,12,16,17,20,21,25,26,30,31,35,36,39,40,44,45,49,50,54,55,59,

%T 60,63,64,68,69,73,74,78,79,83,84,87,88,92,93,97,98,102,103,106,107,

%U 111,112,116,117,121,122,126,127,130,131,135,136,140,141,145

%N The index values of the smallest and the largest n-digit Fibonacci numbers.

%C = A072354 + A072353 [From _Parthasarathy Nambi_, Sep 14 2009]

%H Harvey P. Dale, <a href="/A164018/b164018.txt">Table of n, a(n) for n = 0..999</a>

%e The index value of the smallest ten digit Fibonacci number is 45. The index value of the largest ten digit Fibonacci number is 49.

%t Drop[Flatten[{#-1,#}&/@Flatten[Table[Position[IntegerLength[Fibonacci[ Range[250]]],n,1,1],{n,50}]]],{2}](* _Harvey P. Dale_, Jun 04 2018 *)

%Y Cf. A000045

%K base,nonn

%O 0,2

%A _Parthasarathy Nambi_, Aug 07 2009

%E More terms from _Harvey P. Dale_, Jun 04 2018