|
|
A302975
|
|
a(n) = denominator of tau(n)^n / n^tau(n).
|
|
3
|
|
|
1, 1, 9, 64, 25, 81, 49, 1, 1, 625, 121, 1, 169, 2401, 50625, 1048576, 289, 1, 361, 15625, 194481, 14641, 529, 6561, 15625, 28561, 531441, 117649, 841, 2562890625, 961, 1, 1185921, 83521, 1500625, 262144, 1369, 130321, 2313441, 390625, 1681, 37822859361, 1849
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
tau(n) = the number of the divisors of n (A000005).
Conjecture: all terms are squares.
a(n) >= A302974(n) only for numbers n = 1, 2 and 3.
|
|
LINKS
|
|
|
FORMULA
|
a(p) = p^2 for p = prime.
|
|
EXAMPLE
|
For n = 6; tau(6)^6 / 6^tau(6) = 4^6 / 6^4 = 256 / 81; a(6) = 81.
|
|
MATHEMATICA
|
Denominator[#[[2]]^#[[1]]/#[[1]]^#[[2]]]&/@Table[{n, DivisorSigma[0, n]}, {n, 50}] (* _Harvey P. Dale_, Sep 15 2019 *)
|
|
PROG
|
(Magma) [Denominator((NumberOfDivisors(n)^n) / (n^NumberOfDivisors(n))): n in[1..100]]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,frac
|
|
AUTHOR
|
_Jaroslav Krizek_, Apr 16 2018
|
|
STATUS
|
approved
|
|
|
|