OFFSET
1,1
COMMENTS
Are there odd terms in this sequence? There are none below 10^8.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
MATHEMATICA
f[n_] := Plus @@ DeleteDuplicates @ Map[EulerPhi, Divisors[n]]; s[n_] := Plus @@ Most @ FixedPointList[f, n] - n; Select[Range[24000], s[#] == # &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Oct 07 2021
STATUS
approved