mersenneforum.org - An Elemental Puzzle

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davar55

2007-03-06 22:10

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.

davieddy

2007-03-06 22:30

Is the isotope relevant?

m_f_h

2007-03-07 01:49

very funny

Hmmm...
[spoiler] Their atomic number is a Mersenne prime exponent.[/spoiler]

cheesehead

2007-03-07 01:59

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

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

and

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

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