isabelle/valid/amc12a_2008_p15.thy (12 lines of code) (raw):

(* Authors: Albert Qiaochu Jiang *) theory amc12a_2008_p15 imports Complex_Main begin theorem amc12a_2008_p15: fixes k :: nat assumes h0 : "k = 2008^2 + 2^2008" shows "(k^2 + 2^k) mod 10 = 6" sorry end