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 A139114 #5 Nov 03 2016 09:16:38
%S A139114 11,12,23,34,55,86,137,218,349,5510,8911,14412,23313,37714,61015,
%T A139114 98716,159717,258418,418119,676520,1094621,1771122,2865723,4636824,
%U A139114 7502525,12139326,19641827,31781128,51422929,83204030,134626931,217830932
%N A139114 Concatenation of n-th Fibonacci number and n.
%H A139114 Harvey P. Dale, <a href="/A139114/b139114.txt">Table of n, a(n) for n = 1..1000</a>
%t A139114 #[[1]]*10^IntegerLength[#[[2]]]+#[[2]]&/@Table[{Fibonacci[n],n},{n,40}] (* _Harvey P. Dale_, Nov 03 2016 *)
%Y A139114 Cf. A000027, A000045, A045532, A075110, A138821, A138822, A139113.
%K A139114 base,easy,nonn
%O A139114 1,1
%A A139114 _Omar E. Pol_, Apr 09 2008