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A319682 Restricted growth sequence transform of A300832. 4

%I #8 Sep 29 2018 18:42:24

%S 1,2,2,3,2,4,2,5,6,7,2,8,2,9,10,11,2,12,2,13,14,15,2,16,17,12,18,19,2,

%T 20,2,21,22,23,24,25,2,26,27,28,2,29,2,30,31,32,2,33,7,34,35,25,2,36,

%U 27,37,38,39,2,40,2,41,42,43,44,45,2,46,47,48,2,49,2,50,51,52,53,54,2,55,56,57,2,58,59,60,61,62,2,63,64,65,66,67,68,69,2,70,71,72,2,73,2,49

%N Restricted growth sequence transform of A300832.

%C For all i, j: a(i) = a(j) => A318320(i) = A318320(j).

%H Antti Karttunen, <a href="/A319682/b319682.txt">Table of n, a(n) for n = 1..65537</a>

%o (PARI)

%o up_to = 65537;

%o 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 A019565(n) = {my(j,v); factorback(Mat(vector(if(n, #n=vecextract(binary(n), "-1..1")), j, [prime(j), n[j]])~))}; \\ From A019565

%o A300832(n) = { my(m=1); fordiv(n,d,if(-1==moebius(n/d), m *= A019565(d))); m; };

%o v319682 = rgs_transform(vector(up_to,n,A300832(n)));

%o A319682(n) = v319682[n];

%Y Cf. A300832, A319681.

%K nonn

%O 1,2

%A _Antti Karttunen_, Sep 29 2018

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Last modified April 27 23:22 EDT 2024. Contains 372020 sequences. (Running on oeis4.)