138 (number)

138 (one hundred [and] thirty-eight) is the natural number following 137 and preceding 139.

In mathematics[]

138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of three primes, such that in base 10, the third prime is a concatenation of the other two: ${\displaystyle 2\cdot 3\cdot 23}$.

138 is the third 47-gonal number^[1] and an Ulam number,^[2] as well as a one step palindrome (138 + 831 = 969.)

138 is the 72nd normal congruent number^[3] and the 49th primitive or square free congruent number.^[4]

In astronomy[]

• 138 Tolosa is a brightly colored, stony main belt asteroid
• The New General Catalogue object NGC-138, a spiral galaxy in the constellation Pisces
• The Saros number of the solar eclipse series which began on June 6, 1472 and will end on July 11, 2716. The duration of Saros series 138 is 1244 years, and it contains 70 solar eclipses
• 138P/Shoemaker-Levy is a periodic comet in the Solar System

In the military[]

• United States Air Force 138th Fighter Wing fighter unit stationed at Tulsa International Airport, Oklahoma
• USS Advocate (AM-138) was a United States Navy Admirable-class minesweeper, transferred to the Soviet Navy in 1943
• USS Braxton (APA-138) was a United States Navy Haskell-class attack transport during World War II
• USS Cheleb (AK-138) was a United States Navy Crater-class cargo ship during World War II
• USS Douglas L. Howard (DE-138) was a United States Navy Edsall-class destroyer escort during World War II
• USS General C. G. Morton (AP-138) was a United States Navy General G. O. Squier-class transport ship during World War II
• USS Kennison (DD-138) was a United States Navy Wickes-class destroyer during World War II

In transportation[]

• 138th Street–Grand Concourse, the Bronx station on the IRT Jerome Avenue Line of the New York City Subway
• Third Avenue–138th Street, the Bronx station on the IRT Pelham Line of the New York City Subway

In media[]

• "We Are 138", a 1978 song by the American punk rock band Misfits
• 1.3.8., a 2000 compilation album by the American death metal band Devourment

In other fields[]

138 is also:

• The year AD 138 or 138 BC
• The atomic number of untrioctium, a temporary chemical element
• Psalm 138
• Sonnet 138 by William Shakespeare

See also[]

• List of highways numbered 138
• United Nations Security Council Resolution 138
• United States Supreme Court cases, Volume 138

References[]

• 138 Constellations