This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A073550 #16 Jul 22 2025 09:09:26 %S A073550 3,14,134,1334,13334,133334,1333334,13333334,133333334,1333333334, %T A073550 13333333334,133333333334,1333333333334,13333333333334, %U A073550 133333333333334,1333333333333334,13333333333333334,133333333333333334 %N A073550 Number of Fibonacci numbers F(k), k <= 10^n, which end in 1. %H A073550 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10). %F A073550 a(n) = ceiling((10^n-1)/60) + ceiling((10^n-2)/60) + ceiling((10^n-8)/60) + ceiling((10^n-19)/60) + ceiling((10^n-22)/60) + ceiling((10^n-28)/60) + ceiling((10^n-41)/60) + ceiling((10^n-59)/60). %F A073550 a(n) = ceiling(40/3*10^(n-1)) for n>1. - _Benoit Cloitre_, Aug 27 2002; [Edited by _Felix Fröhlich_, Jun 08 2019] %e A073550 a(2) = 14 because there are 14 Fibonacci numbers up to 10^2 which end in 1. %Y A073550 Cf. A072675. Different from A072509. %K A073550 base,nonn %O A073550 1,1 %A A073550 _Shyam Sunder Gupta_, Aug 15 2002 %E A073550 More terms from _Vladeta Jovovic_, Aug 20 2002