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 A086104 #8 Aug 10 2025 16:52:37
%S A086104 23,71,11,31,71,13,17,37,71,11,31,71,31,71,11,71,11,71,31,71,31,11,11,
%T A086104 31,71,73,13,73,13,73,73,73,17,17,97,97,37,97,37,17,17,97,37,79,79,19,
%U A086104 79,19,79,79,19,79,19,71,31,11,11,31,11,11,31,71,11,31,71,31,71,31,11
%N A086104 Primes appearing as concatenation of the last digit of Prime[A086101(n)] and the first digit of Prime[A086101(n)+1].
%C A086104 Prime numbers in A166499. - _Zak Seidov_, Oct 15 2009
%t A086104 Select[Table[FromDigits[{IntegerDigits[Prime[n]][[-1]],IntegerDigits[Prime[n+1]][[1]]}], {n,300}],PrimeQ] (* _Zak Seidov_, Oct 15 2009 *)
%Y A086104 Cf. A086101.
%K A086104 easy,nonn,base
%O A086104 1,1
%A A086104 _Zak Seidov_, Jul 09 2003