13
This number is a prime.
Just showing those entries submitted by 'Silva': (Click here to show all)
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| Photo credit: Patrick Kik |
The first Fibonacci emirp. [Silva]
There are 13 composite numbers between 13 and its reversal. [Silva]
The longest name of a book of the KJV Bible is Thessalonians with 13 letters. [Silva]
The smallest prime formed from consecutive odd digits. [Silva]
13!+31!-1 is prime. [Silva]
The smallest prime sum of semiprimes. [Silva]
The only Fibonacci prime equal to the sum of the squares of
two consecutive Fibonacci primes. [Silva]
13 squared equals the sum of the first five
emirps. [Silva]
The number of five-digit primes formed from the five nonzero nonprime digits. [Silva]
13 + (1+3) is the next emirp. The only two-digit emirp with that property. [Silva]
The smallest expansive prime, i.e., a prime from which
another can be obtained by repeating its digits in order,
each digit repeated d times. [Silva]
The first member of the smallest pair of cousin emirps. [Silva]