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2008-08-27, 19:56
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#1 |
May 2004
New York City
2·29·73 Posts |
Primes by Concatenation
Just for fun:
(1) How large a prime can be constructed by concatenating distinct, known Mersenne prime exponents in some order? (Since it appears M45* is on its way -- (congrats!!) -- this problem might be considered to be in temporary limbo.) (2) What are the largest and smallest primes that can be constructed by concatenating the integers 1 thru 100 in some order? (3) Suppose I have 5 different 5-digit primes. How many primes could I expect to produce by concatenating these in different orders? |
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