cp's OEIS Frontend

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.

A336126 Lexicographically earliest infinite sequence such that a(i) = a(j) => A000035(i) = A000035(j) and A007814(1+A000265(i)) = A007814(1+A000265(j)), for all i, j >= 1.

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%I A336126 #8 Jul 13 2020 21:31:32
%S A336126 1,2,3,2,1,4,5,2,1,2,3,4,1,6,7,2,1,2,3,2,1,4,5,4,1,2,3,6,1,8,9,2,1,2,
%T A336126 3,2,1,4,5,2,1,2,3,4,1,6,7,4,1,2,3,2,1,4,5,6,1,2,3,8,1,10,11,2,1,2,3,
%U A336126 2,1,4,5,2,1,2,3,4,1,6,7,2,1,2,3,2,1,4,5,4,1,2,3,6,1,8,9,4,1,2,3,2,1,4,5,2,1
%N A336126 Lexicographically earliest infinite sequence such that a(i) = a(j) => A000035(i) = A000035(j) and A007814(1+A000265(i)) = A007814(1+A000265(j)), for all i, j >= 1.
%C A336126 Restricted growth sequence transform of the ordered pair [A000035(n), A007814(1+A000265(n))], parity and the number of trailing 1-bits in the odd part of n (i.e., the length of the rightmost run of 1-bits in its binary expansion).
%C A336126 For all i, j: A336146(i) = A336146(j) => a(i) = a(j).
%H A336126 Antti Karttunen, <a href="/A336126/b336126.txt">Table of n, a(n) for n = 1..65537</a>
%H A336126 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a>
%o A336126 (PARI)
%o A336126 up_to = 65537;
%o A336126 rgs_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(om,invec[i]), my(pp = mapget(om, invec[i])); outvec[i] = outvec[pp] , mapput(om,invec[i],i); outvec[i] = u; u++ )); outvec; };
%o A336126 A000265(n) = (n>>valuation(n,2));
%o A336126 A007814(n) = valuation(n,2);
%o A336126 Aux336126(n) = [(n%2),A007814(1+A000265(n))];
%o A336126 v336126 = rgs_transform(vector(up_to, n, Aux336126(n)));
%o A336126 A336126(n) = v336126[n];
%Y A336126 Cf. A000265, A007814, A336146.
%K A336126 nonn
%O A336126 1,2
%A A336126 _Antti Karttunen_, Jul 13 2020