OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
MATHEMATICA
f[p_, e_] := (p^2 - 1)*p^(e - 1); a[1] = 1; a[n_] := Times @@ f @@@ FactorInteger[n]; Array[a, 100] (* Amiram Eldar, Oct 16 2022 *)
PROG
(PARI) A345052(n) = { my(f=factor(n)); prod(i=1, #f~, ((f[i, 1]^2)-1)*(f[i, 1]^(f[i, 2]-1))); };
CROSSREFS
KEYWORD
nonn,mult,easy
AUTHOR
Antti Karttunen, Jun 08 2021
STATUS
approved