“80,000”的意思、由来-开放百科全书

词条

80,000

释义

Selected numbers in the range 80,000–89,999
80,001 to 80,999 81,000 to 81,999 82,000 to 82,999 83,000 to 83,999 84,000 to 84,999 85,000 to 85,999 86,000 to 86,999 87,000 to 87,999 88,000 to 88,999 89,000 to 89,999
References

80,000 (eighty thousand) is the natural number that comes after 79,999 and before 80,001. It is a round number, the approximate number of hours in one's career, and the name of career advisory service 80,000 Hours.

Selected numbers in the range 80,000–89,999

80,001 to 80,999

80,286 – model number of the Intel 80286 chip
80,386 – model number of the Intel 80386 chip
80,486 – model number of the Intel 80486 chip
80,782 – Pell number P₁₄^[1]

81,000 to 81,999

82,000 to 82,999

82,000 – the only currently known number greater than 1 that can be written in bases from 2 through 5 using only 0s and 1s.^[2]^[3]
82,656 – Kaprekar number: 82656² = 6832014336; 68320 + 14336 = 82656^[4]
82,944 - 3-smooth number: 2¹⁰ × 3⁴

83,000 to 83,999

83,160 – highly composite number^[5]
83,521 – 17⁴

84,000 to 84,999

85,000 to 85,999

85,085 - product of five consecutive primes: 5 × 7 × 11 × 13 × 17
85,184 – 44³

86,000 to 86,999

86,400 – seconds in a day: 24 × 60 × 60 and common DNS default time to live

87,000 to 87,999

87,360 – unitary perfect number^[6]

88,000 to 88,999

88,888 – repdigit

89,000 to 89,999

References

1. ^{{Cite OEIS|1=A000129|2=Pell numbers|accessdate=2016-06-16}}
2. ^Sequence A146025 in The On-Line Encyclopedia of Integer Sequences
3. ^Sequence A258107 in The On-Line Encyclopedia of Integer Sequences
4. ^{{Cite OEIS|1=A006886|2=Kaprekar numbers|accessdate=2016-06-16}}
5. ^{{Cite OEIS|1=A002182|2=Highly composite numbers|accessdate=2016-06-16}}
6. ^{{Cite OEIS|1=A002827|2=Unitary perfect numbers|accessdate=2016-06-16}}

1 : Integers

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