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  2. Prime number theorem - Wikipedia

    en.wikipedia.org/wiki/Prime_number_theorem

    Graph of the number of primes ending in 1, 3, 7, and 9 up to n for n < 10 000. Another example is the distribution of the last digit of prime numbers. Except for 2 and 5, all prime numbers end in 1, 3, 7, or 9. Dirichlet's theorem states that asymptotically, 25% of all primes end in each of these four digits.

  3. The repeating decimal commonly written as 0.999... represents exactly the same quantity as the number one. Despite having the appearance of representing a smaller number, 0.999... is a symbol for the number 1 in exactly the same way that 0.333... is an equivalent notation for the number represented by the fraction 1 ⁄ 3 .

  4. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    1/52! chance of a specific shuffle Mathematics: The chances of shuffling a standard 52-card deck in any specific order is around 1.24 × 10 −68 (or exactly 1 ⁄ 52!) [4] Computing: The number 1.4 × 10 −45 is approximately equal to the smallest positive non-zero value that can be represented by a single-precision IEEE floating-point value.

  5. Bitcoin - Wikipedia

    en.wikipedia.org/wiki/Bitcoin

    One bitcoin is divisible to eight decimal places. [7]: ch. 5 Units for smaller amounts of bitcoin are the millibitcoin (mBTC), equal to 1 ⁄ 1000 bitcoin, and the satoshi [a] (sat), representing 1 ⁄ 100 000 000 (one hundred millionth) bitcoin, the smallest amount possible. [2] 100,000 satoshis are one mBTC. [68]

  6. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    In such cases, the system can be treated as a mixture of the acid or base and water, which is an amphoteric substance. By accounting for the self-ionization of water, the true pH of the solution can be calculated. For example, a 5 × 10 −8 M solution of HCl would have a pH of 6.89 when treated as a mixture of HCl and water. The self ...

  7. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...

  8. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    The ECTS system was implemented at Norway's universities and colleges in the early 2000s, with most schools having converted to ECTS by 2003. Before 2003, the formerly most common system of grades used at the university level was based on a scale running from 1.0 (highest) through 6.0 (lowest), with 4.0 being the lowest passing grade.

  9. IPv6 - Wikipedia

    en.wikipedia.org/wiki/IPv6

    These addresses are typically displayed in dot-decimal notation as decimal values of four octets, each in the range 0 to 255, or 8 bits per number. Thus, IPv4 provides an addressing capability of 2 32 or approximately 4.3 billion addresses.