OFFSET
1,2
LINKS
FORMULA
For n >= 1, a(2^n) = 2.
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; };
A318458(n) = bitand(n, sigma(n)-n);
Aux324532(n) = if(1==n, 0, [hammingweight(n), A318458(n)]);
v324532 = rgs_transform(vector(up_to, n, Aux324532(n)));
A324532(n) = v324532[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 05 2019
STATUS
approved