OFFSET
1,8
COMMENTS
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16385
FORMULA
PROG
(PARI)
up_to = (2^16)+1;
DirSqrt(v) = {my(n=#v, u=vector(n)); u[1]=1; for(n=2, n, u[n]=(v[n]/v[1] - sumdiv(n, d, if(d>1&&d<n, u[d]*u[n/d], 0)))/2); u};
A049599(n) = factorback(apply(e -> (1+numdiv(e)), factor(n)[, 2]));
v318671_62 = DirSqrt(vector(up_to, n, A049599(n)));
A318671(n) = numerator(v318671_62[n]);
A318672(n) = denominator(v318671_62[n]);
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Antti Karttunen, Sep 03 2018
STATUS
approved