165 (one hundred [and] sixty-five) is the natural number following 164 and preceding 166.
In mathematics
165 is:
- an odd number, a composite number, and a deficient number.
- a sphenic number.
- a tetrahedral number.[1]
- the number of prime knots with 10 crossings.[2]
- the sum of the sums of the divisors of the first 14 positive integers.[3]
- a self number in base 10.
- a palindromic number in binary (101001012) and bases 14 (BB14), 32 (5532) and 54 (3354).
- a unique period in base 2.
References
- ^ "Sloane's A000292 : Tetrahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ Sloane, N. J. A. (ed.). "Sequence A002863 (Number of prime knots with n crossings)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
External links
- Number Facts and Trivia: 165
- The Number 165
- The Positive Integer 165
- VirtueScience: 165 Archived 2021-01-21 at the Wayback Machine
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