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From Wikipedia, the free encyclopedia

← 137  138  139 →
Cardinalone hundred thirty-eight
Ordinal138th
(one hundred thirty-eighth)
Factorization2 × 3 × 23
Divisors1, 2, 3, 6, 23, 46, 69, 138
Greek numeralΡΛΗ´
Roman numeralCXXXVIII
Binary100010102
Ternary120103
Quaternary20224
Quinary10235
Senary3506
Octal2128
DuodecimalB612
Hexadecimal8A16
Vigesimal6I20
Base 363U36

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

In the military

In transportation

In media

In other fields

138 is also:

See also

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A095311 (47-gonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
  2. ^ A002858 in the OEIS
  3. ^ in the OEIS
  4. ^ in the OEIS
This page was last edited on 6 September 2019, at 01:50
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