1. Jack was writing on a scrap of paper as he waited in the car. "See that number, Dad?" he said, pointing to the car ahead. "I got something on it." "The four figures?" Harry shook his head. "That doesn't look so very unusual to me." The boy smiled. "It's one less than six times the sum of the squares of its two halves." What was it then?

The number was 1307

The number was 1303

The number was 1305