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 A163300 #30 Aug 01 2024 01:38:14
%S A163300 0,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,
%T A163300 50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,
%U A163300 96,98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132
%N A163300 Even numbers without 2.
%C A163300 Zero together with the even nonprimes. - _Omar E. Pol_, Aug 04 2009
%C A163300 A163300 U A014076 = A141468.
%C A163300 The nonprime numbers (A018252) begin: 1,4,6,8,9,10,12,14,15,... So the words "prime" and "nonprime" normally refer to the natural numbers or positive integers: 1,2,3,4,5,6,... (Zero is not a member of A018252. See also the definition of A141468). - _Omar E. Pol_, Aug 04 2009
%H A163300 G. C. Greubel, <a href="/A163300/b163300.txt">Table of n, a(n) for n = 1..1000</a>
%H A163300 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).
%F A163300 a(n) = 2*A087156(n).
%t A163300 Drop[Range[0,132,2],{2}] (* _Harvey P. Dale_, May 05 2012 *)
%o A163300 (PARI) a(n)=if(n>1,2*n,0) \\ _Charles R Greathouse IV_, Apr 17 2024
%o A163300 (Python)
%o A163300 def A163300(n): return n<<1 if n>1 else 0 # _Chai Wah Wu_, Jul 31 2024
%Y A163300 Cf. A087156, A014076, A141468, A018252.
%K A163300 nonn,easy
%O A163300 1,2
%A A163300 _Juri-Stepan Gerasimov_, Jul 26 2009
%E A163300 New definition from _Charles R Greathouse IV_, Jun 23 2024