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%I #7 Jul 11 2015 00:50:51
%S 266,3,719,795,799,269,258,286,4207,1037,4236,4278,256,4169,4182,4189,
%T 271,4338,4402,4598,4662,4108,312,5357,6157,4104,4159,7247,7295,7407,
%U 7549,8063,4157,8189,4141,12431,12463,12539,15487,4349,4239,7391,16522
%N a(n) = smallest k such that the base 4 Reverse and Add! trajectory of A075421(n) joins the trajectory of k.
%C a(n) <= A075421(n); a(n) = A075421(n) iff the trajectory of A075421(n) does not join the trajectory of any smaller number, i.e., A075421(n) is also a term of A091675.
%C a(n) determines a 1-1-mapping from the terms of A075421 to the terms of A091675. For the inverse mapping cf. A091677.
%C Base-4 analog of A089493.
%H <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%e A075421(1) = 290, the trajectory of 290 (A075299) joins the trajectory of 266 = A091675(12) at 4195, so a(1) = 266. A075421(6) = 1210, the trajectory of 1210 joins the trajectory of 269 = A091675(13) at 17975, so a(6) = 269.
%Y Cf. A075421, A091675, A075299, A089493.
%K nonn,base
%O 1,1
%A _Klaus Brockhaus_, Jan 28 2004