OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Module[{upto=200}, Complement[Range[1, upto, 2], Table[n+EulerPhi[n], {n, Prime[ Range[PrimePi[upto]]]}]]] (* Harvey P. Dale, Jun 21 2019 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Oct 10 2009
EXTENSIONS
Entries checked by R. J. Mathar, May 21 2010.
STATUS
approved