About This Lesson
Take the sum of the squares of its digits; 32 + 42 = 9 + 16 = 25;25 => 22 + 52 = 4 + 25 = 29;29 => 22 + 92 = 4 + 81 = 85;85 => 82 + 52 = 64 + 25 = 89. . .keep going to find out if 34 is happy! If the pattern ends in 1; then the original number is a happy number. How many happy numbers are there less than 20? Less than 30? Can you find a pattern?
