c0 = 53^2 - 28^2 = 25 * 81 = 2025

c1 = 54^2 - 22^2 = 32 * 76 = 2432

c2 = 51^2 - 11^2 = 40 * 62 = 2480

c = 51^2 - 8^2 = 43 * 59 = 2537

>>7268251

It's really fun

>>7268299

Prove it

>>7268471

In The End, the books will be opened.

What will be in yours?