A305296 - OEIS

%I #7 Jun 01 2018 21:41:33

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

%T 8,1,19,20,21,22,3,23,16,2,24,25,26,27,3,28,2,29,7,30,28,30,31,32,33,

%U 2,34,31,20,18,17,16,2,8,35,36,37,38,39,8,40,41,4,42,43,44,31,45,16,46,47,48,49,50,51,4,52,53,4,1,54,15,3

%N Restricted growth sequence transform of A305295(n), formed from 1-digits in ternary representation of A245612(n).

%C For all i, j: a(i) = a(j) => A305431(i) = A305431(j).

%H Antti Karttunen, <a href="/A305296/b305296.txt">Table of n, a(n) for n = 0..65537</a>

%o (PARI)

%o A003961(n) = my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); \\ From A003961

%o A048673(n) = (A003961(n)+1)/2;

%o A254049(n) = A048673((2*n)-1);

%o A245612(n) = if(n<2,1+n,if(!(n%2),(3*A245612(n/2))-1,A254049(A245612((n-1)/2))));

%o A289813(n) = { my (d=digits(n, 3)); from digits(vector(#d, i, if (d[i]==1, 1, 0)), 2); } \\ From A289813

%o A305295(n) = A289813(A245612(n));

%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 v305296 = rgs_transform(vector(65538,n,A305295(n-1)));

%o A305296(n) = v305296[1+n];

%Y Cf. A245612, A289813, A305295, A305431.

%Y Cf. also A305297, A305298.

%Y Cf. also A304758, A304740.

%K nonn

%O 0,2

%A _Antti Karttunen_, May 31 2018