An Elemental Puzzle

davar55 · 2007-03-06, 22:10

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

Hmmm...
Their atomic number is a Mersenne prime exponent.

cheesehead · 2007-03-07, 01:59

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 ?

2007-03-06, 22:10	#1
davar55 May 2004 New York City 1000010001011₂ Posts	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.

2007-03-07, 01:49	#3
m_f_h Feb 2007 110110000₂ Posts	very funny Hmmm... Their atomic number is a Mersenne prime exponent.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Some puzzle	Harrywill	Puzzles	4	2017-05-03 05:10
Elemental Puzzle #4	davar55	Puzzles	11	2016-01-10 12:53
Elemental Puzzle	davar55	Puzzles	420	2014-12-05 23:06
Elemental Puzzle #2	davar55	Puzzles	10	2006-05-26 01:17
now HERE'S a puzzle.	Orgasmic Troll	Puzzles	6	2005-12-08 07:19

2007-03-06, 22:30	#2
davieddy "Lucan" Dec 2006 England 2×3×13×83 Posts	Is the isotope relevant?

2007-03-07, 01:59	#4
cheesehead "Richard B. Woods" Aug 2002 Wisconsin USA 2²×3×641 Posts	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 ?