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1987 (number)

April 10, 2024

1987 is the natural number following 1986 and preceding 1988.

← 1986 1987 1988 →
Cardinalone thousand nine hundred eighty-seven
Ordinal1987th
(one thousand nine hundred eighty-seventh)
Factorizationprime
Primeyes
Greek numeral,ΑϠΠΖ´
Roman numeralMCMLXXXVII
Binary111110000112
Ternary22011213
Senary131116
Octal37038
Duodecimal119712
Hexadecimal7C316

In mathematics edit

1987 is an odd number and the 300th prime number. It is the first number of a sexy prime triplet (1987, 1993, 1999). Being of the form 4n + 3, it is a Gaussian prime. It is a lucky number and therefore also a lucky prime. 1987 is a prime factor of the 9th number in Sylvester's sequence, and is the 15th prime to divide any number in the sequence.

There are 1987 polyiamonds with 12 cells that tile the plane isohedrally.[1]

In other fields edit

  • There are 1987 ways to place four non-attacking chess kings on a 5 × 5 board.[2]

References edit

  1. ^ (sequence A075223 in the OEIS).
  2. ^ (sequence A061997 in the OEIS).


 

This article about a number is a stub. You can help Wikipedia by expanding it.

April 10, 2024
1987, number, 1987, natural, number, following, 1986, preceding, 1988, 1986, 1987, 1988, list, numbersintegers, cardinalone, thousand, nine, hundred, eighty, sevenordinal1987th, thousand, nine, hundred, eighty, seventh, factorizationprimeprimeyesgreek, numeral. 1987 is the natural number following 1986 and preceding 1988 1986 1987 1988 List of numbersIntegers 0 1k 2k 3k 4k 5k 6k 7k 8k 9k Cardinalone thousand nine hundred eighty sevenOrdinal1987th one thousand nine hundred eighty seventh FactorizationprimePrimeyesGreek numeral AϠPZ Roman numeralMCMLXXXVIIBinary111110000112Ternary22011213Senary131116Octal37038Duodecimal119712Hexadecimal7C316In mathematics edit1987 is an odd number and the 300th prime number It is the first number of a sexy prime triplet 1987 1993 1999 Being of the form 4n 3 it is a Gaussian prime It is a lucky number and therefore also a lucky prime 1987 is a prime factor of the 9th number in Sylvester s sequence and is the 15th prime to divide any number in the sequence There are 1987 polyiamonds with 12 cells that tile the plane isohedrally 1 In other fields editThere are 1987 ways to place four non attacking chess kings on a 5 5 board 2 References edit sequence A075223 in the OEIS sequence A061997 in the OEIS nbsp This article about a number is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title 1987 number amp oldid 1152702107, wikipedia, wiki, book, books, library,

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