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 A134072 #14 Feb 16 2025 08:33:06
%S A134072 1,31,431,7431,117431,18117431,2918117431,472918117431,76472918117431,
%T A134072 12376472918117431,19912376472918117431,32219912376472918117431,
%U A134072 52132219912376472918117431,84352132219912376472918117431
%N A134072 Concatenation of A000204 Lucas numbers (beginning at 1) in reverse order.
%C A134072 Indices of prime terms are {2, 3, 5, 11, ...}. Primes are listed in A134071 = {31, 431, 117431, 19912376472918117431, ...}.
%H A134072 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LucasNumber.html">Lucas Number</a>
%H A134072 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SmarandacheSequences.html">Smarandache Sequences</a>
%t A134072 Module[{nn=20,lnos},lnos=LucasL[Range[nn]];Table[FromDigits[Flatten[ IntegerDigits/@ Reverse[Take[lnos,n]]]],{n,nn}]] (* _Harvey P. Dale_, Jul 27 2015 *)
%Y A134072 Cf. A000204 (Lucas numbers).
%Y A134072 Cf. A130774 (concatenation of Lucas numbers).
%Y A134072 Cf. A019523 (concatenation of Fibonacci numbers).
%Y A134072 Cf. A038399 (concatenation of first n nonzero Fibonacci numbers in reverse order).
%Y A134072 Cf. A134069 (primes in A038399).
%Y A134072 Cf. A134070 (primes in A130774).
%Y A134072 Cf. A134071 (primes in A134072).
%K A134072 nonn,base
%O A134072 1,2
%A A134072 _Alexander Adamchuk_, Oct 06 2007
%E A134072 Edited by _Charles R Greathouse IV_, Apr 26 2010