OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..4309
FORMULA
MATHEMATICA
f[p_, e_] := (p - 1)*(p^e + 1)^2/((p^e - 1)*(p^(e + 1) - 1)); s[1] = 1; s[n_] := Times @@ f @@@ FactorInteger[n]; Select[s /@ Range[10^5], IntegerQ] (* Amiram Eldar, Sep 12 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Yasutoshi Kohmoto, Sep 24 2006
EXTENSIONS
More terms from Amiram Eldar, Sep 12 2022
STATUS
approved