Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
n_1 - n_2 + n_3 = 2, 2 n_2 = n_1 n_4, 2 n_2 = n_3 n_5, n_1 >= 1, n_2 >= 1, n_3 >= 1, n_4 >= 3
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random