+**73** is the natural number following 72 and preceding 74. It is a [prime number](/wiki/Prime_number), holding the distinction of being the 21st prime in the sequence. Often noted for its unique mathematical properties, it is also famously known as the [Sheldon prime](/wiki/Sheldon_prime).
+## See also
+- [Natural Number](/wiki/Natural_Number)
+- [Number Theory](/wiki/Number_Theory)
+- [Twin Prime](/wiki/Twin_Prime)
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