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 A262205 #23 Sep 08 2022 08:46:14
%S A262205 353,7177,9239,113111,5324153,5726957,5927759,6934769,8141981,9750997,
%T A262205 101547101,123677123,131739131,153883153,1791063179,1891129189,
%U A262205 2011229201,2071279207,2311453231,2491579249,2631669263,2691723269,2791801279
%N A262205 Primes that are the concatenation of n, prime(n) and n.
%e A262205 353 is a prime number that is concatenation of 3, prime(3) and 3.
%e A262205 7177 is a prime number that is concatenation of 7, prime(7) and 7.
%e A262205 9239 is a prime number that is concatenation of 9, prime(9) and 9.
%t A262205 f[n_] := Block[{d = IntegerDigits@ n, p = IntegerDigits@ Prime@ n}, FromDigits@ Join[d, p, d]]; Select[f /@ Range@ 300, PrimeQ] (* _Michael De Vlieger_, Sep 15 2015 *)
%o A262205 (PARI) for(n=1, 1e3, if(isprime(k=eval(Str(n, prime(n), n))), print1(k", ")))
%o A262205 (Magma) [p: n in [1..400] | IsPrime(p) where p is Seqint(Intseq(n) cat Intseq(NthPrime(n)) cat Intseq(n))]; // _Bruno Berselli_, Sep 15 2015
%Y A262205 Cf. A084667, A084669, A084670, A084671.
%K A262205 nonn,easy,base
%O A262205 1,1
%A A262205 _Altug Alkan_, Sep 15 2015