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Fancy picture[edit]

At 3 (telecommunications), there is a fancy picture of a 3. At Channel 4, there is a fancy picture of a 4. Do any Wikipedia articles mention a fancy picture of a 2?? Georgia guy 23:05, 18 Jan 2005 (UTC)

Numerical prefixes for 2[edit]

Like the other numbers, 2 has a Greek numerical prefix and a Latin numerical prefix. Unlike the other numbers, however, there is also a prefix for 2, twi-, that is neither Greek nor Latin. What language is it?? Georgia guy 23:18, 20 Jan 2005 (UTC)

I'm not really sure it's a prefix - I would guess that "twice" and "twin" are just derived from "two", which itself comes from "duo". It's not like sticking "twi-" on the front of any other word would make sense. sjorford 15:01, 21 Jan 2005 (UTC)
My dictionary (Webster's NewWorld, college edition) says "twi-" is a prefix from Middle English via Old English. There are plenty of other twi- words; see my additions to twi-. dbenbenn | talk 16:04, 21 Jan 2005 (UTC)
I stand corrected...but twitch? twig? Do those really derive from "twi-" meaning "two"? Bizarre if so. sjorford 16:25, 21 Jan 2005 (UTC)
Good questions, now answered at twi-. dbenbenn | talk 20:37, 21 Jan 2005 (UTC)
And damn good answers, if I do say so my damn self. sjorford 21:53, 21 Jan 2005 (UTC)

The only even prime number[edit]

I think the statement about "2 being the only prime number that is even" should be removed. It is true, but only in a trivial and non "wikipedy" sense.

We could also say that 3 is the only prime number divisible by 3, or that 5 is the only prime number divisible by 5.

Every prime number p is the only prime number divisible by p - and this fact is not (of course) stated in any of their pages.

"14 is the largest natural number below 15", "100 is the smallest 3-digit natural number", etc., are also true but have no "wikipedy" value, and therefore are not written.

(I suspect that because we have a special word, "even", instead of "divisible by 2" - is what gave birth to "2 is the only even prime" and what makes it sound non-trivial for a second. Roypit (talk) 10:40, 4 July 2022 (UTC)Reply[reply]

It's been identified as a notable property of 2 for a long time, more or less in the vein that 0 is even. These are not necessarily trivial, but rather more in line with exceptional. This is because the even "nature" of 2 blends with its prime properties; as such, it is useful both when dealing with special prime numbers such as Mersenne primes and Fermat primes, while being distinctively relevant inside abundant numbers and deficient numbers, for example. I hope this helps. B, Radlrb (talk) 20:46, 4 October 2022 (UTC)Reply[reply]

Information.svg An editor has identified a potential problem with the redirect and has thus listed it for discussion. This discussion will occur at Wikipedia:Redirects for discussion/Log/2022 July 4#꤂ until a consensus is reached, and readers of this page are welcome to contribute to the discussion. 1234qwer1234qwer4 22:58, 4 July 2022 (UTC)Reply[reply]

Link Donald_Thomson article[edit] FynderEnlil (talk) 14:28, 1 February 2023 (UTC)Reply[reply]