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A091676 a(n) = smallest k such that the base 4 Reverse and Add! trajectory of A075421(n) joins the trajectory of k. 2

%I

%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

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Last modified September 20 08:10 EDT 2021. Contains 347577 sequences. (Running on oeis4.)