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 A075110 #23 Sep 08 2022 08:45:07
%S A075110 21,32,53,74,115,136,177,198,239,2910,3111,3712,4113,4314,4715,5316,
%T A075110 5917,6118,6719,7120,7321,7922,8323,8924,9725,10126,10327,10728,10929,
%U A075110 11330,12731,13132,13733,13934,14935,15136,15737,16338,16739,17340
%N A075110 Concatenation of n-th prime and n in decimal notation.
%H A075110 Reinhard Zumkeller, <a href="/A075110/b075110.txt">Table of n, a(n) for n = 1..10000</a>
%F A075110 a(n) = A000040(n)*10^(A004216(n)+1) + n.
%t A075110 Table[FromDigits[Join[IntegerDigits[Prime[n]], IntegerDigits[n]]], {n, 40}] (* _Vincenzo Librandi_, Mar 24 2019 *)
%o A075110 (Haskell)
%o A075110 a075110 n = read $ show (a000040 n) ++ show n :: Integer
%o A075110 -- _Reinhard Zumkeller_, Jul 08 2014
%o A075110 (PARI) a(n) = eval(Str(prime(n), n)); \\ _Michel Marcus_, Mar 24 2019
%o A075110 (Magma) [Seqint(Intseq(n) cat Intseq(NthPrime(n))): n in [1..46]]; // _Vincenzo Librandi_, Mar 24 2019
%Y A075110 Cf. A045532.
%K A075110 nonn,base
%O A075110 1,1
%A A075110 _Reinhard Zumkeller_, Sep 03 2002