OFFSET
1,2
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; };
A001065(n) = (sigma(n)-n);
A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));
v374479 = rgs_transform(vector(up_to, n, Aux374479(n)));
A374479(n) = v374479[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 07 2024
STATUS
approved