OFFSET
0,2
COMMENTS
LINKS
FORMULA
a(2^n) = 3 for all n >= 1.
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; };
A005940(n) = { my(p=2, t=1); n--; until(!n\=2, if((n%2), (t*=p), p=nextprime(p+1))); t };
A046523(n) = { my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]); }; \\ From A046523
v324345 = rgs_transform(vector(1+up_to, n, Aux324345(n-1)));
A324345(n) = v324345[1+n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 24 2019
STATUS
approved