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The number of distinct prime factors of a pronic number is the sum of the number of distinct prime factors of n and n + 1. If 25 is appended to the decimal representation of any pronic number, the result is a square number, the square of a number ending on 5; for example, 625 = 25 2 and 1225 = 35 2. This is so because
A number n that has more divisors than any x < n is a highly composite number (though the first two such numbers are 1 and 2). Composite numbers have also been called "rectangular numbers", but that name can also refer to the pronic numbers , numbers that are the product of two consecutive integers.
Numzi also has an iOS app which is a portable Major System number-word converter. 2Know is free Windows software for converting numbers to words (English, German, French). Mnemisis Another free mnemonic program - runs on Linux, Mac OS X, and Windows; Memagine iPhone app that uses the system to teach how to recall a list of up to 100 items in ...
So too are the thousands, with the number of thousands followed by the word "thousand". The number one thousand may be written 1 000 or 1000 or 1,000; larger numbers are written for example 10 000 or 10,000 for ease of reading. European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator.
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.”
The Indian numbering system uses the named numbers common between the long and short scales up to ten thousand. For larger values, it includes named numbers at each multiple of 100; including lakh (10 5) and crore (10 7). [1] English also has words, such as zillion, that are used informally to mean large but unspecified amounts.
Hoefler Text, a typeface designed in 1991, uses text figures. The ascending six and descending nines are minted on this 1996 U.S. penny. Text figures (also known as non-lining, lowercase, old style, [1] ranging, hanging, medieval, billing, [2] or antique [3] figures or numerals) are numerals designed with varying heights in a fashion that resembles a typical line of running text, hence the name.
The vertical forms of the digits (1–9, 10–90, 100–900 and 1,000–9,000), with an innovative form of 5 as engraved on an early-sixteenth-century Norman astrolabe. All Cistercian numerals from 1 to 9999 [ 15 ] (open to enlarge).