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A304729 Restricted growth sequence transform of A046523(A303751(n)). 6

%I #6 May 19 2018 12:39:07

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

%T 15,16,5,4,7,4,9,6,17,6,9,18,2,3,8,3,7,4,9,4,7,19,3,8,20,8,19,7,18,7,

%U 21,12,13,22,13,23,15,16,15,10,21,4,7,19,7,18,9,24,9,25,10,26,11,12,13,12,10,15,16,15,10,21,12,13,22,13,21,10,25,10,27,28

%N Restricted growth sequence transform of A046523(A303751(n)).

%H Antti Karttunen, <a href="/A304729/b304729.txt">Table of n, a(n) for n = 1..76503</a>

%o (PARI)

%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 A046523(n) = { my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]); }; \\ From A046523

%o v304729 = rgs_transform(vector(76503,n,A046523(A303751(n)))); \\ Needs also code from A303751

%o A304729(n) = v304729[n];

%Y Cf. A046523, A303751.

%Y Cf. also A304728, A304098, A304732.

%K nonn

%O 1,2

%A _Antti Karttunen_, May 19 2018

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Last modified February 22 06:21 EST 2024. Contains 370240 sequences. (Running on oeis4.)