I bought a RGB led common anode from radioshack #276-0028 and i want to makee sure i did the calcuations right for the resistor value.

(green/blue)

Forward current: 30ma

Forward voltage: 3.5 v typ 4.0v max

(Red)

Forward current: 50 ma

Forward voltage: 2.0v typ 2.6v max

mA =(1.25/R) x 15].

For 30ma I got

1.25/650 ohms x 15=0.0288

For 50ma I got

1.25/400 ohms x 15=0.046875

Because I done the calculations for 20 ma and it gave me

1.25/1000 ohm x 15=0.01875