OFFSET
1,2
FORMULA
EXAMPLE
a(5) = 21, since 5^2 = 25 and phi(5) = 4.
MATHEMATICA
Table[n^2 - EulerPhi[n], {n, 200}]
PROG
(PARI) vector(50, n, n^2-eulerphi(n)) \\ Michel Marcus, May 30 2015
(Magma) [n^2 - EulerPhi(n): n in [1..60]]; // Vincenzo Librandi, Jun 03 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Carlos Eduardo Olivieri, May 30 2015
STATUS
approved