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 A325495 #6 May 06 2019 08:48:22 %S A325495 2,1,3,3,3,2,4,2,1,3,2,1,3,4,2,2,1,3,3,3,2,1,3,3,3,2,1,3,2,2,2,2,1,3, %T A325495 3,3,2,4,2,1,3,2,1,3,3,3,2,1,3,2,1,3,2,4,3,3,2,1,3,4,2,2,1,3,3,3,2,4, %U A325495 2,1,3,2,1,3,4,2,2,1,3,3,3,2,4,3,3,2 %N A325495 Difference sequence of A325420. %C A325495 See A325417 for a guide to related sequences. Conjecture: every term is in {1,2,3,4}. %t A325495 a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1, %t A325495 Apply[Or, Map[MemberQ[a, #] &, Select[Flatten[{#/3, (# - 1)/2}], %t A325495 IntegerQ]]] &]], {2000}]; a ; (* A325419 *) %t A325495 c = Complement[Range[Last[a]], a] ; (* A325420 *) %t A325495 Differences[a] (* A325494 *) %t A325495 Differences[c] (* A325495 *) %t A325495 (* _Peter J. C. Moses_, Apr 23 2019 *) %Y A325495 Cf. A325417, A325494. %K A325495 nonn,easy %O A325495 1,1 %A A325495 _Clark Kimberling_, May 05 2019