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 A169798 #10 Jan 24 2023 10:08:16 %S A169798 41,61,83,89,101,127,149,151,163,181,1201,1213,1223,1249,1259,2267, %T A169798 2273,2281,2309,3203,3301,3343,3359,3361,3389,3391,3407,4201,4409, %U A169798 4451,4463,4481,4493,4507,4513,4523,4547,5501,5563,5573,5581,6007,6203,6263,6421 %N A169798 a(n) = smallest prime number > a(n-1) that contains the n-th composite number as a substring. %H A169798 Zak Seidov, <a href="/A169798/b169798.txt">Table of n,a(n) for n=1..1000</a> %Y A169798 Cf. A144565. %Y A169798 Cf. A177981, A177982. [From _Reinhard Zumkeller_, May 16 2010] %K A169798 nonn,base %O A169798 1,1 %A A169798 _N. J. A. Sloane_, May 15 2010 %E A169798 Corrected and extended by _Zak Seidov_ and _D. S. McNeil_, May 16 2010