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; };
A003961(n) = { my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); };
Aux369447(n) = [sigma(n)-n, gcd(sigma(n), A003961(n))];
v369447 = rgs_transform(vector(up_to, n, Aux369447(n)));
A369447(n) = v369447[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 25 2024
STATUS
approved