73 (number)

73 (seventy-three) is a number. It comes after seventy-two, but before seventy-four. 73 is the 21st prime number. Its mirror, 37, is the 12th, and its mirror, 21, is the product of multiplying seven and three and in binary, 73 is a palindrome, 1001001, which backwards is 1001001.

73 (number) Media

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  73 as a star number (up to blue dots). 37, its dual permutable prime, is the preceding consecutive star number (up to green dots).

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  Lah numbers for n and k between 1 and 4. The sum of values with n = 4 and k = \{1,2,3,4\} is 73.