OFFSET
1,2
COMMENTS
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..100000
PROG
(PARI)
up_to = 100000;
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; };
A319704aux(n) = if(isprime(n), -(n%4), n);
v319704 = rgs_transform(vector(up_to, n, A319704aux(n)));
A319704(n) = v319704[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 26 2018
STATUS
approved