OFFSET
1,3
COMMENTS
All terms are powers of 2. - Jianing Song, Sep 28 2018
MATHEMATICA
Do[If[IntegerQ[Log[2, EulerPhi[n]]], Print[n]; ta[[u]]=n; u=u+1], {n, 1, 10000}] EulerPhi[ta]
PROG
(PARI) for(n=1, 1000, my(i=eulerphi(n)); if(omega(2*i)==1, print1(i, “, “))) \\ Jianing Song, Sep 28 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jun 02 2004
STATUS
approved