OFFSET
1,2
FORMULA
a(n) = 4*n^2 - A064400(n) = 4*n^2 - 3*n*phi(n).
MAPLE
with(numtheory): A064485:=n->4*n^2-3*n*phi(n): seq(A064485(n), n=1..50); # Wesley Ivan Hurt, Oct 08 2014
MATHEMATICA
Table[4 n^2 - 3 n*EulerPhi[n], {n, 50}] (* Wesley Ivan Hurt, Oct 08 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Dan Fux (dan.fux(AT)OpenGaia.com or danfux(AT)OpenGaia.com), Oct 03 2001
EXTENSIONS
More terms from Eric M. Schmidt, Oct 08 2014
STATUS
approved