isabelle/valid/mathd_numbertheory_35.thy (11 lines of code) (raw):

(* Authors: Wenda Li *) theory mathd_numbertheory_35 imports Complex_Main "HOL-Computational_Algebra.Computational_Algebra" begin theorem mathd_numbertheory_35: assumes "k^2 = 196" shows "(\<Sum> k \<in> { n ::nat. n dvd k}. k) = (24::nat)" sorry end