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From Wikipedia, the free encyclopedia

← 162  163  164 →
Cardinalone hundred sixty-three
Ordinal163rd
(one hundred sixty-third)
Factorizationprime
Prime38th
Divisors1, 163
Greek numeralΡΞΓ´
Roman numeralCLXIII
Binary101000112
Ternary200013
Senary4316
Octal2438
Duodecimal11712
HexadecimalA316

163 (one hundred [and] sixty-three) is the natural number following 162 and preceding 164.

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Transcription

In mathematics

163 is a strong prime in the sense that it is greater than the arithmetic mean of its two neighboring primes.

163 is a lucky prime[1] and a fortunate number.[2]

163 is a strictly non-palindromic number, since it is not palindromic in any base between base 2 and base 161.

Given 163, the Mertens function returns 0, it is the fourth prime with this property, the first three such primes are 2, 101 and 149.[3]

As approximations, , and

163 is a permutable prime in base 12, which it is written as 117, the permutations of its digits are 171 and 711, the two numbers in base 12 are 229 and 1021 in base 10, both of which are prime.

The function gives prime values for all values of between 0 and 39, while for approximately half of all values are prime. 163 appears as a result of solving , which gives .

163 is a Heegner number, the largest of the nine such numbers. That is, the ring of integers of the field has unique factorization for . The only other such integers are . (sequence A003173 in the OEIS)

163 is the number of linearly Z-independent McKay-Thompson series for the monster group, which also represent their collective maximum dimensional representation. This fact about 163 might be a clue for understanding monstrous moonshine.[4]

appears in the Ramanujan constant, since -163 is a quadratic nonresidue to modulo all the primes 3, 5, 7, ..., 37. In which almost equals the integer 262537412640768744 = 6403203 + 744. Martin Gardner famously asserted that this identity was exact in a 1975 April Fools' hoax in Scientific American; in fact the value is 262537412640768743.99999999999925007259...

In other fields

163 is also:

  • The number of days following the first day of Passover (Pesach), used to calculate the date of Rosh Hashanah, the Jewish New Year.
  • The Burj Khalifa in Dubai, United Arab Emirates, which is the tallest building in the world, has 163 floors.
  • In darts, 163 is the lowest number that cannot be shot with three darts on a standard dart board.

See also

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A031157 (Numbers that are both lucky and prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A005235 (Fortunate numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  3. ^ Sloane, N. J. A. (ed.). "Sequence A100669 (Zeros of the Mertens function that are also prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  4. ^ He, Yang-Hui; McKay, John (2015). "Sporadic and exceptional". pp. 1–49. arXiv:1505.06742 [math.AG]. (See p. 13)

External links

This page was last edited on 18 March 2024, at 16:48
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