OFFSET
3,1
LINKS
Indranil Ghosh, Table of n, a(n) for n = 3..10000
FORMULA
EXAMPLE
For n = 11, phi(11) = 10 which has prime factors 2 and 5. So, 2+5 = 7 and a(11) = 7. - Indranil Ghosh, Jan 18 2017
MATHEMATICA
Table[Apply[Plus, Transpose[FactorInteger[EulerPhi[n]]][[1]]], {n, 3, 100}]
Table[Total[FactorInteger[EulerPhi[n]][[All, 1]]], {n, 3, 100}] (* Harvey P. Dale, May 30 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Feb 28 2003
STATUS
approved