61 (number)

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61 (sixty-one) is the natural number following 60 and preceding 62.

← 60 61 62 63 64 65 66 67 68 69 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	61 sixty-one
Ordinal	61st sixty-first
Factorization	prime
Divisors	1, 61
Roman numeral	LXI
Binary	111101
Hexadecimal	3D

Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In other fields 4 In sports 5 Historical years 6 Reference 7 External links

[edit] In mathematics

It is the 18th prime number. The previous is 59, with which it comprises a twin prime. Sixty-one is a cuban prime of the form p = (x³ − y³) / (x − y),x = y + 1.

Sixty-one might be the largest prime that divides the product of the next two primes plus 1. If there is a larger such prime, it would have to be greater than 179424673.

Sixty-one is the sum of two squares, 5² + 6², and it is also a centered square number, a centered hexagonal number and a centered decagonal number.

Since 8! + 1 is divisible by 61 but 61 is not one more than a multiple of 8, 61 is a Pillai prime.

It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 6, 1, 7, 8, 15, 23, 38, 61...

[edit] In science

The chemical element with the atomic number 61 (promethium), a lanthanide, is the element with the secondary lowest ordinal number, which does not possess any stable isotopes. The promethium preceding element with atomic number 60 (neodymium) and the promethium following element 62 (samarium) have all stable isotopes.

[edit] Astronomy

• Messier object M61, a magnitude 10.5 galaxy in the constellation Virgo

• The New General Catalogue object NGC 61, a double spiral galaxy in the constellation Pisces

• The Saros number of the solar eclipse series which began on -973 May 10 and ended on 289 June 5. The duration of Saros series 61 was 1262.1 years, and it contained 71 solar eclipses.

• The Saros number of the lunar eclipse series which began on -870 October 20 and ended on 609 March 26. The duration of Saros series 61 was 1478.4 years, and it contained 83 lunar eclipses.

• 61 Ursae Majoris is located about 31.1 light-years from Sol.[1]

• 61 Cygni was christened the "Flying Star" in 1792 by Giuseppe Piazzi (1746-1826) for its unusually large proper motion. [2]

[edit] In other fields

Sixty-one is:

• The number of the French department Orne
• The code for international direct dial phone calls to Australia
• 61*, a 2001 baseball movie directed by Billy Crystal
• A number often related to the Colonel's insane speech in Metal Gear Solid 2: Sons of Liberty
• The Highway 61 Blues Festival occurs in June in Leland, Massachusetts
• Part 61 is a law created by the FAA regarding medical exams. This law has often come under attack by AOPA.
• Highway 61 Revisited is a Bob Dylan album
• Scout Pack and Troop 61 both serve the town of Mansfield, Connecticut
• Troop 61 is one of the oldest and best-known Boy Scout troops in the Kansas City area
• The P-61 is the Northrop designed fighter first designated as the XP-61. It first flew on May 26, 1942. It is also known as the Black Widow as it was the first fighter aircraft designed to be a night fighter
• Sixty 1 brand tobacco produced by Nationwide Tobacco
• At 61, W.C. Fields starred in Never Give a Sucker an Even Break 1941
• At 61, President Harry Truman decided to drop atom bomb in 1945
• At 61, President Richard Nixon, 61, resigned the presidency in 1974. He was succeed by Gerald Ford, 61
• 61A is the London address of [argot Wendice (Grace Kelly) and[Tony Wendice](Ray Milland) in the movie "Dial M for Murder"
• 1 Liberty Place is Philadelphia's tallest building at 61 stories

[edit] In sports

• New York Yankees Roger Maris hit 61 home runs in 1961
• Nolan Ryan and Tom Seaver each had 61 career shutouts
• Hockey great Wayne Gretzky holds or shares 61 NHL records (40 for regular season, 15 for Stanley Cup playoff and 6 for All-Star Games)
• Los Angeles Lakers' Elgin Baylor set a record for 61 points in a NBA finals game against the Boston Celtics (April 14, 1962)
• Anaheim Angels Steven Soliz wears #61
• Brian Bannister wore #61 with the New York Mets
• Cincinnati Reds Bronson Arroyo wears #61
• Buffalo Sabres Maxim Afinogenov wears #61
• Carolina Hurricanes Cory Stillman wears #61
• Blue Jackets Rick Nash wears #61
• Denver Broncos Gerald Warren wears #61

[edit] Historical years

61 A.D., 61 B.C., 1961, 2061, etc.

[edit] Reference

• R. Crandall and C. Pomerance (2005). Prime Numbers: A Computational Perspective. Springer, NY, 2005, p. 79.

[edit] External links

• Highway 61 Blues Festival website
• Scout Pack 61
• Kansas City Boy Scount Troop 61
• XP-61 fighter