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 A221699 #14 Jan 31 2024 18:37:29
%S A221699 11,12,14,16,20,21,23,25,29,30,32,34,38,41,43,47,49,50,52,56,58,61,65,
%T A221699 67,70,74,76,83,85,89,92,94,98,111,112,114,116,121,141,161,203,205,
%U A221699 211,230,250,302,320,411,502,520,611,1111,1112,1114,1116,1121,1141,1161
%N A221699 Numbers with property that each sum any pair of digits is prime.
%C A221699 Supersequence of A091939. Subsequence of A182175.
%H A221699 Vincenzo Librandi, <a href="/A221699/b221699.txt">Table of n, a(n) for n = 1..145</a>
%e A221699 Number 203 is a term because 2+3=5, 2+0=2, 3+0=3 (primes).
%t A221699 fQ[n_] := Module[{d = IntegerDigits[n]}, Union[PrimeQ[Plus @@@ Union[Subsets[d, {2}]]]] == {True}]; Select[Range[6000], fQ] (* _T. D. Noe_, Jan 24 2013 *)
%t A221699 Select[Range[10,1200],AllTrue[Total/@Subsets[IntegerDigits[#],{2}],PrimeQ]&] (* _Harvey P. Dale_, Jan 31 2024 *)
%Y A221699 Cf. A172508, A091939, A182175.
%K A221699 nonn,base
%O A221699 1,1
%A A221699 _Jaroslav Krizek_, Jan 22 2013