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 A104420 #7 Oct 14 2019 14:22:16
%S A104420 1,2,3,4,5,11,13,15,26,27,33,36,48,51,55,60,61,65,71,83,100,101,106,
%T A104420 112,115,116,117,123,126,151,170,173,177,200,203,206,216,221,225,230,
%U A104420 231,233,234,235,240,241,253,255,271,275,281,283,284,286,287
%N A104420 Numbers n such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 9-less.
%C A104420 n, p[n], p[n]+n, p[n]-n and p[n]*n all are 0-less gives A104419.
%H A104420 Harvey P. Dale, <a href="/A104420/b104420.txt">Table of n, a(n) for n = 1..1000</a>
%t A104420 id[x_]:=IntegerDigits[x];pr[i_]:=Prime[i];ra=Range[300];A104420=Select[ra, Last[Union[id[ # ], id[pr[ # ]], id[pr[ # ]+# ], id[pr[ # ]-# ], id[pr[ # ]*# ]]]!=9&]
%t A104420 nlsQ[n_]:=Module[{p=Prime[n]},Max[DigitCount[{n,p,p+n,p-n,p*n},10,9]] == 0]; Select[Range[300],nlsQ] (* _Harvey P. Dale_, Oct 14 2019 *)
%Y A104420 Cf. A104419.
%K A104420 nonn,base
%O A104420 1,2
%A A104420 _Zak Seidov_, Mar 07 2005