OFFSET
1,3
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
FORMULA
MATHEMATICA
Table[EulerPhi[n^2]-EulerPhi[n], {n, 60}] (* Harvey P. Dale, Aug 22 2012 *)
PROG
(PARI) a(n)=if(n<1, 0, eulerphi(n^2)-eulerphi(n))
(PARI) { for (n=1, 1000, write("b062955.txt", n, " ", eulerphi(n^2) - eulerphi(n)) ) } \\ Harry J. Smith, Aug 14 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 22 2001
STATUS
approved