OFFSET

0,2

COMMENTS

Restricted growth sequence transform of A366879.

LINKS

PROG

(PARI)

up_to = 65537;

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; };

A163511(n) = if(!n, 1, my(p=2, t=1); while(n>1, if(!(n%2), (t*=p), p=nextprime(1+p)); n >>= 1); (t*p));

A326938(n) = sumdiv(n, d, if(n/d%2, moebius(n/d)*moebius(d)*d));

v366880 = rgs_transform(vector(1+up_to, n, A366879(n-1)));

A366880(n) = v366880[1+n];

CROSSREFS

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 27 2023

STATUS

approved