Prime Curios!: 127

127
(another Prime Pages' Curiosity)

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The 1st and 2nd perfect numbers are respectively the number of digits and sum of digits of the 7th Mersenne prime (524287), while the 1st and 2nd Mersenne primes are respectively the number of digits and the sum of digits of the 7th untouchable number (124). Note that the latter is short of a prime by each of the 1st, 2nd and 4th Mersenne primes, this last one being 127. [Beedassy]

Submitted: 2009-08-29 02:33:32; Last Modified: 2009-08-29 08:48:26.