The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105501 Numbers n such that 1 is the leading digit of the n-th Fibonacci number in decimal representation. 11
 1, 2, 7, 12, 17, 21, 22, 26, 27, 31, 36, 40, 41, 45, 46, 50, 55, 60, 64, 65, 69, 70, 74, 79, 84, 88, 89, 93, 94, 98, 103, 107, 108, 112, 113, 117, 122, 127, 131, 132, 136, 137, 141, 146, 151, 155, 156, 160, 161, 165, 170, 174, 175, 179, 180, 184, 189, 194, 198, 199 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A008963(a(n)) = 1; A105511(a(n)) = A105511(a(n) - 1) + 1. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 FORMULA a(n) ~ kn by the equidistribution theorem, where k = log(10)/log(2) = 3.321928.... - Charles R Greathouse IV, Oct 07 2016 EXAMPLE a(10)=31: A008963(31) = A000030(A000045(31)) = A000030(1346269) = 1. MAPLE filter:= proc(n) local t;   t:= combinat:-fibonacci(n);   t < 2*10^ilog10(t) end proc: select(filter, [\$1..200]); # Robert Israel, May 02 2018 MATHEMATICA fQ[n_] := IntegerDigits[Fibonacci[n]][[1]] == 1; Select[Range@200, fQ] (* Robert G. Wilson v, May 02 2018 *) PROG (PARI) is(n)=digits(fibonacci(n))[1]==1 \\ Charles R Greathouse IV, Oct 07 2016 CROSSREFS Cf. A000030, A000045, A072675, A105502, A105503, A105504, A105505, A105506, A105507, A105508, A105509. Sequence in context: A160455 A045929 A277598 * A016873 A019592 A220120 Adjacent sequences:  A105498 A105499 A105500 * A105502 A105503 A105504 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Apr 11 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 14 15:03 EDT 2021. Contains 343884 sequences. (Running on oeis4.)