41

This number is a prime.

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Brittany Finch © 2004

A prime number of length 41 can be constructed by concatenating the exponents of the first consecutive Mersenne primes, separated by 0's. (Hint: the number of exponents used is the reversal of 41.) [Hartley]

There are 41(41-1) ways to write 41 as a sum of Fibonacci numbers. [Hartley]

41 is the first prime element of the Goodstein sequence starting with four. [Hartley]