OFFSET
1,2
COMMENTS
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; };
A173557(n) = factorback(apply(p -> p-1, factor(n)[, 1]));
A319993(n) = { my(f=factor(n)); prod(i=1, #f~, if(2==f[i, 1], -(1==f[i, 2]), (f[i, 1]^(f[i, 2]-1)))); };
A319999(n) = v319999[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 08 2018
STATUS
approved