OFFSET
1,2
MATHEMATICA
f[n_] := EulerPhi[EulerPhi[n]]/n; a={}; fm=10^10; Do[f1=f[k]; If[f1<fm , fm=f1; AppendTo[a, k]], {k, 1, 10^6}]; a
PROG
(PARI) lista(nn) = {my(rmin = 2); for (n=1, nn, if ((r=eulerphi(eulerphi(n))/n) < rmin, rmin = r; print1(n, ", ")); ); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Oct 15 2017
EXTENSIONS
a(26)-a(34) from Michel Marcus, Oct 18 2017
a(35)-a(38) from Amiram Eldar, Nov 12 2024
STATUS
approved