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Old 2007-03-06, 22:10   #1
davar55
 
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May 2004
New York City

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Default An Elemental Puzzle

I'm almost embarassed to try this one ...

What do the following 11 elements, and no others (so far)
have in common?

Actinium, Aluminum, Bohrium, Boron, Chlorine, Gallium, Helium,
Lithium, Nitrogen, Potassium, and Promethium.
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Old 2007-03-06, 22:30   #2
davieddy
 
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"Lucan"
Dec 2006
England

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Is the isotope relevant?
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Old 2007-03-07, 01:49   #3
m_f_h
 
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Feb 2007

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Default very funny

Hmmm...
Their atomic number is a Mersenne prime exponent.
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Old 2007-03-07, 01:59   #4
cheesehead
 
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"Richard B. Woods"
Aug 2002
Wisconsin USA

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So, this is your third in a series that began with

http://mersenneforum.org/showthread.php?t=5503

and

http://mersenneforum.org/showthread.php?t=5557 ?
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