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 A067087 #14 Dec 07 2024 17:11:12
%S A067087 22,33,55,77,1111,1331,1771,1991,2332,2992,3113,3773,4114,4334,4774,
%T A067087 5335,5995,6116,6776,7117,7337,7997,8338,8998,9779,101101,103301,
%U A067087 107701,109901,113311,127721,131131,137731,139931,149941,151151,157751
%N A067087 Concatenation of n-th prime and its reverse.
%C A067087 Every term of the sequence is divisible by 11.
%H A067087 Harry J. Smith, <a href="/A067087/b067087.txt">Table of n, a(n) for n = 1..1000</a>
%F A067087 a(n) = A056524(prime(n)). - _Andrew Howroyd_, Dec 07 2024
%t A067087 Table[ ToExpression[ StringJoin[ ToString[Prime[n]], StringReverse[ ToString[ Prime[n]]]]], {n, 1, 40} ]
%t A067087 #*10^IntegerLength[#]+IntegerReverse[#]&/@Prime[Range[50]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Nov 11 2017 *)
%o A067087 (PARI) a(n) = { my(d=digits(prime(n))); fromdigits(concat(d,Vecrev(d))) } \\ _Harry J. Smith_, May 13 2010
%Y A067087 Cf. A056524.
%K A067087 easy,nonn,base
%O A067087 1,1
%A A067087 _Amarnath Murthy_, Jan 07 2002
%E A067087 More terms from _Robert G. Wilson v_, Jan 09 2002