25 (twenty-five) is the
natural number following
24 and preceding
26.
The
atomic number of manganese
It is a
square number, being
5² = 5 × 5. It is the smallest square that is also a sum of two squares: 25 = 3² + 4². Hence it often appears in demonstrations of the
Pythagorean theorem.
25 is a
centered octagonal number and an
automorphic number.
25 has an
aliquot sum of 6 and is the first number to have an
aliquot sequence that does not culminate in 0 through a
prime. Twenty-five is the
aliquot sum of three
integers;
95,
119, and
143. Twenty-five is the second composite member of the 6-aliquot tree.
It is the smallest
base 10 Friedman number as it can be expressed by its own numbers: 5².
It is also a
Cullen number. 25 is the smallest
pseudoprime satisfying the congruence 7n = 7 mod n. It is also a
Somer pseudoprime based on 6.
25 is the smallest
aspiring number — a composite non-
sociable number whose
aliquot sequence does not terminate.
According to the
Shapiro inequality 25 is the least odd integer n such that there exist such that
where xn + 1 = x1,xn + 2 = x2.
Within base 10 one can readily test for divisibility by 25 by seeing if the last two digits of the number match 25, 50, 75 or 00.
25 and 49 are the only perfect squares in the following list:
13,25,37,49,511,613,715,817,919,1021,1123,1225,1327,1429...etc
The formula in this list can be described as 10n * Z + (2Z + 1) where n clearly depends on the number of digits in Z and in 2z+1.
The
atomic number of
manganeseIn
Ezekiel's vision of a new temple: The number twenty-five is of cardinal importance in
Ezekiel's Temple Vision (in the Bible,
Ezekiel chapters 40-48).
The size of the full roster on a
major league baseball team
The number of points needed to win a set in
volleyball under rally scoring rules (except for the fifth set), so long as the losing team's score is two less than the winning team's score (i.e., if the winning team scores 25 points, the losing team can have no more than 23 points)
Twenty five is:
The number of years of marriage marked in a silver
wedding anniversary.
The minimum age of candidates for election to the
United States House of Representatives. "Under 25" provides a common cut-off point for designating
youth.
The number of cents in a
quarter.
The usual
TCP port for
SMTP.
The designation of
United States Interstate 25, a freeway that runs from
New Mexico to
WyomingThe designation of the
M25 London Orbital motorway
Municipal Okrug 25, a municipal okrug of Kirovsky District of
Saint Petersburg, Russia
The (critical) number of
Florida electoral votes for the
2000 U.S. presidential electionThe name of the national card game of
Ireland and
India (Pachisi — Hindi for 25)
"25", a song by Veruca Salt from their 1994 album
American Thighs"25th Floor", a song by Patti Smith Group from their 1978 album
EasterTwenty Five is the name of a 2006
George Michael compilation celebrating 25 years in the music business (1981-2006)
"25 boy", in Cantonese Chinese, is a slang term meaning "traitor" as used in the Chinese movie
Over the Edge.
The per-second frame rate of the
PAL video standard
The number of the French department
Doubs25 random things about me, an
Internet meme utilizing
Facebook's Notes feature
Pony (British slang for £25)
never mind m paper white due to the bryt flash..m with my ate bing..my laovely landlady who's celebrating her birthday..hearthrobs london was such an experience..especially on the way there.doors open @4pm(it's quite dark already,n bloody cold) show star @5pm.
