OFFSET
1,3
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
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; };
A007431(n) = sumdiv(n, d, moebius(n/d)*eulerphi(d));
v318839 = rgs_transform(vector(up_to, n, A318838(n)));
A318839(n) = v318839[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 05 2018
STATUS
approved