Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jan 24 2023 10:08:16
%S 41,61,83,89,101,127,149,151,163,181,1201,1213,1223,1249,1259,2267,
%T 2273,2281,2309,3203,3301,3343,3359,3361,3389,3391,3407,4201,4409,
%U 4451,4463,4481,4493,4507,4513,4523,4547,5501,5563,5573,5581,6007,6203,6263,6421
%N a(n) = smallest prime number > a(n-1) that contains the n-th composite number as a substring.
%H Zak Seidov, <a href="/A169798/b169798.txt">Table of n,a(n) for n=1..1000</a>
%Y Cf. A144565.
%Y Cf. A177981, A177982. [From _Reinhard Zumkeller_, May 16 2010]
%K nonn,base
%O 1,1
%A _N. J. A. Sloane_, May 15 2010
%E Corrected and extended by _Zak Seidov_ and _D. S. McNeil_, May 16 2010