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 A383485 #6 May 04 2025 12:39:53
%S A383485 1,4,3,12,5,16,0,20,31,24,11,28,0,32,49,36,17,40,0,44,67,48,0,52,54,
%T A383485 56,85,60,29,64,0,68,70,72,109,76,0,80,121,84,41,88,0,92,139,96,0,100,
%U A383485 102,104,157,108,0,112,114,116,175,120,59,124,0,128,130,132,199,136,0,140
%N A383485 a(n) = 2*(2*(n - 1)! + n + 2) (mod n*(n + 2)).
%C A383485 Fixed points are the lesser of twin primes A001359.
%C A383485 Positions of zeros are primes p such that p + 2 is not a prime A067774.
%F A383485 a(A001359(n)) = n.
%F A383485 a(A067774(n)) = 0.
%t A383485 Table[Mod[2(2(n - 1)! + n + 2), n(n + 2)], {n, 68}]
%Y A383485 Cf. A073830, A001359, A067774, A005563.
%K A383485 nonn
%O A383485 1,2
%A A383485 _Giorgos Kalogeropoulos_, Apr 28 2025