53

This number is a prime.

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There are exactly 53 sevens in the first 53 seventh powers. [Gaydos]

53 (exactly half) of the first 106 prime numbers each has at least one prime cousin. [Gaydos]

There are 53 six-digit cubes. [Gaydos]

The sum of the first 53 positive palindromic numbers is divisible by 53. [Gaydos]