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73 and 37 are consecutive primes in the seven-integer covering set of the first known Sierpiński number 78,557 of the form + that is composite for all natural numbers , where 73 is the largest member: {,,,,,}.
Other examples, of internationally recognized uses of Morse code abbreviations and well known code numbers, such as those of the Phillips Code from past eras of telegraph technology, are abbreviations such as WX for weather and SX for dollar, and from wire signal codes, the numbers 73 for best regards and 88 for love and kisses.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
Hyphenate all numbers under 100 that need more than one word. For example, $73 is written as “seventy-three,” and the words for $43.50 are “Forty-three and 50/100.”
Number Nickname Explanation 1 Kelly's eye [3] The pun is military slang; [4] possibly a reference to Ned Kelly, from Ned Kelly's helmet, the eye slot resembling the number 1. 2 One little duck From the resemblance of the number 2 to a duck; see also "22". Response is a single "quack." 3 Cup of tea Rhymes with "three". 4 Knock at the door
73 (number) one of the years 73 BC, AD 73, 1973, 2073; 73, a United States-based amateur radio magazine; 73 Best regards, a popular Morse code abbreviation; No. 73, a British 1980s children's TV show; Nickname for the Boeing 737 airplane; 73 Bristol Temple Meads–Bradley Stoke North, a bus route in England; 73 Klytia, a main-belt asteroid
Mersenne primes and perfect numbers are two deeply interlinked types of natural numbers in number theory. Mersenne primes, named after the friar Marin Mersenne, are prime numbers that can be expressed as 2 p − 1 for some positive integer p. For example, 3 is a Mersenne prime as it is a prime number and is expressible as 2 2 − 1.
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