| ||||
---|---|---|---|---|
Cardinal | forty-seven | |||
Ordinal | 47th (forty-seventh) | |||
Factorization | prime | |||
Prime | 15th | |||
Divisors | 1, 47 | |||
Greek numeral | ΜΖ´ | |||
Roman numeral | XLVII | |||
Binary | 1011112 | |||
Ternary | 12023 | |||
Senary | 1156 | |||
Octal | 578 | |||
Duodecimal | 3B12 | |||
Hexadecimal | 2F16 |
47 (forty-seven) is the natural number following 46 and preceding 48. It is a prime number.
Forty-seven is the fifteenth prime number, a safe prime, [1] the thirteenth supersingular prime, [2] the fourth isolated prime, and the sixth Lucas prime. [3] Forty-seven is a highly cototient number. [4] It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
It is a Lucas number. It is also a Keith number because its digits appear as successive terms earlier in the series of Lucas numbers: 2, 1, 3, 4, 7, 11, 18, 29, 47, ... [5]
It is the number of trees on 9 unlabeled nodes. [6]
Forty-seven is a strictly non-palindromic number. [7]
Its representation in binary being 101111, 47 is a prime Thabit number, and as such is related to the pair of amicable numbers {17296, 18416}.
The number 47 has historical implications to Pomona College, a liberal arts college in Claremont, California, and has been incorporated into various aspects of campus life. [10] [11] The tradition began in the summer of 1964, when two students, Laurie Mets and Bruce Elgin, conducted a research project seeking to find out whether the number occurs more often in nature than would be expected by chance. They documented various 47 sightings, and professor Donald Bentley produced a false mathematical proof that 47 was equal to all other integers. The number became a meme among the class, which spread once the academic year began and snowballed over time. [12]
Notable 47 sightings include the fact that Pomona is located off of exit 47 of Interstate 10, and the fact that the largest residential building on campus, Mudd-Blaisdell (formally Florence Carrier Blaisdell and Della Mullock Mudd Hall, a title with 47 characters), was completed in 1947 and contains a staircase with 47 balusters. [12]
Many Pomona alumni have deliberately inserted 47 references into their work. [10] Joe Menosky (class of 1979), a writer for Star Trek: The Next Generation , inserted 47 mentions into nearly every episode of the show, a practice that has been picked up by other Star Trek writers. [12] [13] [14] Pomona hosts a community service–oriented celebration every April 7 (abbreviated 4/7 in the U.S.). [15] In the early 2010s, the college's clock tower was set up to chime on the 47th minute of the hour. [16] [17]Agent 47 is the protagonist of the Hitman video game, movie and comic book franchise.
Late rapper Capital Steez was infatuated with the number 47 and what it meant spiritually. He believed the number 47 was the "perfect expression of balance in the world", representing the tension between the heart and the brain (the fourth and sixth chakra, respectively.) The number featured on the cover of AmeriKKKan Korruption, stylized to resemble a swastika. [18]
45 (forty-five) is the natural number following 44 and preceding 46.
29 (twenty-nine) is the natural number following 28 and preceding 30. It is a prime number.
83 (eighty-three) is the natural number following 82 and preceding 84.
73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name.
31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.
46 (forty-six) is the natural number following 45 and preceding 47.
48 (forty-eight) is the natural number following 47 and preceding 49. It is one third of a gross, or four dozens.
57 (fifty-seven) is the natural number following 56 and preceding 58.
59 (fifty-nine) is the natural number following 58 and preceding 60.
63 (sixty-three) is the natural number following 62 and preceding 64.
113 is the natural number following 112 and preceding 114.
300 is the natural number following 299 and preceding 301.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
2000 is a natural number following 1999 and preceding 2001.
3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
5000 is the natural number following 4999 and preceding 5001. Five thousand is the largest isogrammic numeral in the English language.
41 (forty-one) is the natural number following 40 and preceding 42.