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 A141560 #16 Feb 19 2021 08:24:31
%S A141560 1,1,4,9,14,15,21,22,25,34,35,40,50,55,62,65,65,68,69,86,91,91,100,
%T A141560 106,111,118,123,124,133,133,135,136,147,158,161,161,164,169,169,177,
%U A141560 182,187,192,200,201,209,222,225,226,246,255,256,259,264,275,280,287,296
%N A141560 Nonprimes of form (prime(n)-r(n)), where A141468(n)=r(n)=n-th nonprime and prime(n)=n-th prime.
%t A141560 Module[{nn=200,np,len},np=Select[Range[0,nn],!PrimeQ[#]&];len= Length[ np];Select[ #[[1]]-#[[2]]&/@Thread[{Prime[Range[len]],np}],!PrimeQ[ #]&]] (* _Harvey P. Dale_, Oct 15 2020 *)
%Y A141560 Cf. A000040, A141468.
%K A141560 nonn,less
%O A141560 1,3
%A A141560 _Juri-Stepan Gerasimov_, Aug 14 2008
%E A141560 Edited, corrected and extended by _Ray Chandler_, Aug 19 2008