#!/usr/bin/env python3 for k in range(2,114): a=set(range(1,k+1))|set(range(k+1 if k% 2==0 else k+2,114,2)) s={x+y for x in a for y in a}; p={x*y for x in a for y in a} if not (s-p): print(k,len(a),sorted(a));break if k in [13,16,20,30,40,60,80,100]: print(k,len(s-p),sorted(s-p)[:20])