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  2. 4-Digits - Wikipedia

    en.wikipedia.org/wiki/4-Digits

    4-Digits. 4-Digits (abbreviation: 4-D) is a lottery in Germany, Singapore, and Malaysia. Individuals play by choosing any number from 0000 to 9999. Then, twenty-three winning numbers are drawn each time. If one of the numbers matches the one that the player has bought, a prize is won.

  3. Bates numbering - Wikipedia

    en.wikipedia.org/wiki/Bates_numbering

    Bates' objective was "generally to increase the effectiveness, simplicity and compactness of machines of this general character". Each time the machine was pressed down onto a sheet of paper, a rotating wheel was moved incrementally. The original machine described by Bates allowed numbering with a four-digit sequence, ranging from 0000 to 9999.

  4. Kaprekar's routine - Wikipedia

    en.wikipedia.org/wiki/Kaprekar's_routine

    Kaprekar's routine. In number theory, Kaprekar's routine is an iterative algorithm named after its inventor, Indian mathematician D. R. Kaprekar. Each iteration starts with a number, sorts the digits into descending and ascending order, and calculates the difference between the two new numbers. As an example, starting with the number 8991 in ...

  5. 100,000,000 - Wikipedia

    en.wikipedia.org/wiki/100,000,000

    100,000,000. 100,000,000 ( one hundred million) is the natural number following 99,999,999 and preceding 100,000,001. In scientific notation, it is written as 10 8 . East Asian languages treat 100,000,000 as a counting unit, significant as the square of a myriad, also a counting unit.

  6. 9000 (number) - Wikipedia

    en.wikipedia.org/wiki/9000_(number)

    9175 – smallest (provable) generalized Sierpiński number in base 10: 9175*10 n +1 is always divisible by one of the prime numbers {7, 11, 13, 73}. 9180 – triangular number; 9200 to 9299. 9216 = 96 2; 9221 – Sophie Germain prime; 9224 – octahedral number; 9241 – cuban prime of the form x = y + 1; 9261 = 21 3, largest 4 digit perfect cube

  7. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    The major system (also called the phonetic number system, phonetic mnemonic system, or Herigone's mnemonic system) is a mnemonic technique used to help in memorizing numbers. The system works by converting numbers into consonants, then into words by adding vowels. The system works on the principle that images can be remembered more easily than ...

  8. Chinese telegraph code - Wikipedia

    en.wikipedia.org/wiki/Chinese_telegraph_code

    It shows one-to-one correspondence between Chinese characters and four-digit numbers from 0000 to 9999. Chinese characters are arranged and numbered in dictionary order according to their radicals and strokes. Each page of the book shows 100 pairs of a Chinese character and a number in a 10×10 table.

  9. List of aircraft registration prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft...

    D-AUAA to D-AZZZ (test registrations) for aircraft manufactured by Airbus at Finkenwerder. D-BAAA to D-BZZZ for aircraft with 14–20 t MTOW. D-CAAA to D-CZZZ for aircraft with 5.7–14 t MTOW. D-EAAA to D-EZZZ for single-engine aircraft up to 2 t MTOW. D-FAAA to D-FZZZ for single-engine aircraft from to 2–5.7 t MTOW.