Bad luck is Alan Turing and Max Newman stopping after checking all
prime exponents between 128 and 512 and finding nothing.
The very next prime exponent 521 was only proved prime a couple
of years later in 1952 by Robinson.
It is unlikely that Newman did any computation on primes on the
first computer before Turing's "Long Division" routine was completed.
http://www.computer50.org/mark1/notes.html#mersenne
http://primes.utm.edu/notes/by_year.html#2
Cheers,
Paul Landon
Luck is running into the tightest grouping of 4 Mersenne primes ever.
Perspiration
is wading through the unlucky area between 3.1 million and 20 million.
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