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Article of the Week [ about ]

A prime number is a number that can be evenly divided by exactly two positive whole numbers, namely 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, and 17. A prime number $p$ cannot be factored as the product of two numbers $\scriptstyle p=a\times b,$ except for the trivial factorizations $\scriptstyle p=1\times p=p\times 1$ that all numbers possess.

With the exception of 2, all prime numbers are odd numbers, but not every odd number is prime. For example, $\scriptstyle 9=3\times 3$ and $\scriptstyle 15=3\times 5,$ so neither 9 nor 15 is prime. By the strict mathematical definition, the number 1 is not considered to be prime (although this is a matter of definition, and mathematicians in the past often did consider 1 to be a prime). [more...]

New Draft of the Week [ about ]

The Red Sea Urchin, Strongylocentrotus franciscanus (A. Agassiz, 1863), is a species of marine invertebrate belonging to the phylum Echinodermata or "spiny-skinned" animals. Typically found in the Pacific ocean from Alaska to Baja California, red urchins inhabit shallow waters from the low-tide line to depths of 100 m. In general, this species prefers wave-sheltered rocky shorelines. [more...]

Citizendium Getting Started
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 <!-- * [[CZ:Approval_Announcements|Newly approved and newly nominated articles]] -->
-=== Draft of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
+=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
-[[Image:Roger_Federer.jpg|130px|right|[[Roger Federer]], today's best player, hitting a forehand against [[James Blake]] in the quarterfinals of the 2006 [[U.S. Open]].]]
+[[Image:Prime rectangles.png|200px|right]]
-'''[[Tennis]]''' is a [[Sports|sport]] played between either two players ("singles") or two teams of two players ("doubles"). Players use a stringed racquet to strike a hollow rubber ball covered with felt over a net into the opponent's court. In some places tennis is still called '''lawn tennis''' to distinguish it from ''real tennis'' (also known as ''royal tennis'' or ''court tennis''), an older form of the game that originated in France in the Middle Ages and is played indoors on a very different court. Originating in England in the late 19th century... <font size=1>[[Tennis|['''more...''']]]</font>
+A '''[[prime number]]''' is a number that can be evenly divided by exactly two positive [[integer|whole numbers]], namely 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, and 17. A prime number <math>p</math> cannot be factored as the [[multiplication|product]] of two numbers <math>\scriptstyle p=a\times b,</math> except for the trivial factorizations <math>\scriptstyle p = 1\times p = p\times 1</math> that all numbers possess.
-=== New Draft of the Week <font size=1>[ [[CZ:New Article of the Week|about]] ]</font> ===
+With the exception of 2, all prime numbers are odd numbers, but not every odd number is prime. For example, <math>\scriptstyle 9 = 3\times 3</math> and <math>\scriptstyle 15 = 3\times 5,</math> so neither 9 nor 15 is prime. By the strict mathematical definition, the number 1 is not considered to be prime (although this is a matter of definition, and mathematicians in the past often did consider 1 to be a prime). <font size=1>[[Prime number|['''more...''']]]</font>
-[[Image:National Theater and Concert Hall of Taiwan.jpg|right|190px|]]
-A '''[[symphony]]''' is a large-scale musical composition for an [[orchestra]]. Since the late eighteenth century, composers have regarded the symphony as “the central form of orchestral composition”, similar to how writers of fiction regard the novel, and filmmakers the feature film. According to music historian Michael Kennedy, the symphony “is reserved by composers for their most weighty and profound orchestral thoughts, but of course there are many light-hearted, witty, and entertaining symphonies.” <font size=1>[[Symphony|['''more...''']]]</font>
+=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
+[[Image:Red-sea-urchin.gif|150px|right]]
+The '''[[Red Sea Urchin]]''', ''Strongylocentrotus franciscanus'' (A. Agassiz, 1863), is a species of marine invertebrate belonging to the phylum [[Echinodermata]] or "spiny-skinned" animals.  Typically found in the Pacific ocean from Alaska to Baja California, red urchins inhabit shallow waters from the low-tide line to depths of 100 m. In general, this species prefers wave-sheltered rocky shorelines. <font size=1>[[Red Sea Urchin|['''more...''']]]</font>
 |}
 {{Getting Started|nocat=y}}