CULTURAL MARKER073
Sheldon's Number
73 · The Big Bang Theory
🌐Internet📜History
“73 is the 21st prime. Its mirror 37 is the 12th. The product of 2 and 1 is... 21. Sheldon was right.”
73 is the 21st prime number. Its mirror, 37, is the 12th prime. Its mirror, 21, is the product of 7 and 3. In binary, 73 is a palindrome: 1001001. Sheldon Cooper called it 'the best number' on The Big Bang Theory — a show watched by 18 million people who now can't see 73 without hearing his voice. In ham radio, '73' means 'best regards' — operators have been signing off with it since 1908.
