OFFSET
1,2
MATHEMATICA
Flatten[Position[Partition[EulerPhi[Range[110]], 2, 1], _?(#[[2]]< 2*#[[1]]&)]]//Quiet(* Harvey P. Dale, Apr 04 2015 *)
PROG
(PARI) j=[]; for(n=1, 200, if(eulerphi(n+1)<2*eulerphi(n), j=concat(j, n))); j
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 26 2001
STATUS
approved