Board Thread:Off Topic/@comment-31320657-20170216194059/@comment-30609372-20170221175249

(73. The best number. 73 is the 21st prime number. Its mirror, 37, is the 12th and its mirror, 21, is the product of multiplying 7 and 3... and in binary 73 is a palindrome, 1001001, which backwards is 1001001.)

79. It is prime. Reverse it, and it is still prime.