OFFSET
1,2
COMMENTS
Sum_{d|n} tau(d)/pod(d) > 1 for all n > 1.
FORMULA
a(p) = p + 2 for prime p > 2.
EXAMPLE
For n=4; Sum_{d|4} tau(d)/pod(d) = tau(1)/pod(1) + tau(2)/pod(2) + tau(4)/pod(4) = 1/1 + 2/2 + 3/8 = 19/8; a(4) = 19.
PROG
(Magma) [Numerator(&+[NumberOfDivisors(d) / &*[c: c in Divisors(d)]: d in Divisors(n)]): n in [1..100]]
(PARI) a(n) = numerator(sumdiv(n, d, numdiv(d)/vecprod(divisors(d)))); \\ Michel Marcus, Jan 25 2019
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Jaroslav Krizek, Jan 24 2019
STATUS
approved