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词条 90,000
释义

  1. Selected numbers in the range 90,000–99,999

     90,001 to 90,999  91,000 to 91,999  92,000 to 92,999  93,000 to 93,999  94,000 to 94,999  95,000 to 95,999  96,000 to 96,999  97,000 to 97,999  98,000 to 98,999  99,000 to 99,999 

  2. References

{{Infobox number
| number = 90000
}}

90,000 (ninety thousand) is the natural number following 89,999 and preceding 90,001. It is the sum of the cubes of the first 24 positive integers, and is the square of 300.

Selected numbers in the range 90,000–99,999

90,001 to 90,999

  • 90,625 – the only five-digit automorphic number: 906252 = 8212890625[1]

91,000 to 91,999

  • 91,125 – 453

92,000 to 92,999

93,000 to 93,999

  • 93,312 – Leyland number: 66 + 66.[2] Also a 3-smooth number.

94,000 to 94,999

  • 94,249 – palindromic square: 3072
  • 94,932 – Leyland number: 75 + 57[2]

95,000 to 95,999

  • 95,121 – Kaprekar number: 951212 = 9048004641; 90480 + 04641 = 95121[3]

96,000 to 96,999

  • 96,557 – Markov number: 52 + 64662 + 965572 = 3 × 5 × 6466 × 96557[4]

97,000 to 97,999

  • 97,336 – 463

98,000 to 98,999

  • 98,304 – 3-smooth number

99,000 to 99,999

  • 99,066 – largest number whose square uses all of the decimal digits once: 990662 = 9814072356. It is also a rotationally symmetric ambigram in decimal.
  • 99,991 - largest five-digit prime number
  • 99,999 – repdigit, Kaprekar number: 999992 = 9999800001; 99998 + 00001 = 99999[3]

References

1. ^{{Cite web|url=https://oeis.org/A003226|title=Sloane's A003226 : Automorphic numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-16}}
2. ^{{Cite web|url=https://oeis.org/A076980|title=Sloane's A076980 : Leyland numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-16}}
3. ^{{Cite web|url=https://oeis.org/A006886|title=Sloane's A006886 : Kaprekar numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-16}}
4. ^{{Cite web|url=https://oeis.org/A002559|title=Sloane's A002559 : Markoff (or Markov) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-16}}

1 : Integers

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