138 (number)
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| Cardinal | one hundred thirty-eight | |||
| Ordinal |
138th (one hundred thirty-eighth) | |||
| Factorization | 2 × 3 × 23 | |||
| Divisors | 1, 2, 3, 6, 23, 46, 69, 138 | |||
| Greek numeral | ΡΛΗ´ | |||
| Roman numeral | CXXXVIII | |||
| Binary | 100010102 | |||
| Ternary | 120103 | |||
| Quaternary | 20224 | |||
| Quinary | 10235 | |||
| Senary | 3506 | |||
| Octal | 2128 | |||
| Duodecimal | B612 | |||
| Hexadecimal | 8A16 | |||
| Vigesimal | 6I20 | |||
| Base 36 | 3U36 | |||
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: .
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 naval ship, 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 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
In media
- American singer Glenn Danzig wrote a song entitled "We are 138", recorded in 1978 by the Misfits
- 1.3.8., a compilation by slam 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
References
- ↑ Sloane, N.J.A. (ed.). "Sequence A095311 (47-gonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
- ↑ A002858 in the OEIS
- ↑ in the OEIS
- ↑ in the OEIS
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