In Mathematics
109 is the 29th prime number, and also a Chen prime. The previous prime is 107, making them both twin primes. 109 is a centered triangular number.
109 is the smallest factor of one more than the product of the first twenty-three terms of the Euclid–Mullin sequence, making it the twenty-fourth term.
109 is the smallest number which is palindromic in bases 5 and 9.
The cycle of the decimal equivalent of 1/109 ends ...853211, the first six Fibonacci numbers in reversed order.
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