The largest prime which cannot be represented with less than 37 5th powers.
The number of primes and the number of composites that cannot be written as the sum of two primes, up to 223, are equal. [Honaker]
The sums of the nth powers of its digits are prime for all n between 1 and 6 inclusive: sum of digits = 7, sum of squares of digits = 17, sum of cubes of digits = 43, sum of fourth powers = 113, sum of fifth powers = 307 and sum of sixth powers = 857. [Trotter]
One saros cycle is almost exactly 223 synodic months.
Prime in the decimal expansion of square root of 5. [Haga]
A chicken and human have 223 enzymes of identical sequence length. [Jolly]
The prime factors of 2p - 1 are all of the form
2kp + 1, where k is a positive integer, and p
is an odd prime. Fermat used this fact to show that 223 divides the Mersenne number M(37).
The concatenation of the two most distant prime dates (2 and 23) for any given day of the month. [Beedassy]
A prime extracted from the names of the most famous Star
Wars droids, i.e., R2-D2 and C-3PO. May the Force of Prime
Numbers be with you ! [Capelle]
The sum of the digits of first primes up to 223 is 449. Note the prime digits and their squares. [Silva]
The smallest 3-digit prime-digit prime. [Green]
The smallest prime showing a repeated prime digit. [Silva]
To link to this page use http://primes.utm.edu/curios/page.php?number_id=117
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