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binary, ternary, octal, decimal, hexadecimal (numbers expressed in base 2, base 3, base 8, base 10, base 16) septuagenarian, octogenarian (a person 70–79 years old, 80–89 years old) centipede , millipede (subgroups of arthropods with around 100 feet, or around 1 000 feet)
Twenty-seven is the cube of 3, or the 2nd tetration of 3: 2 3 = 3 3 = 3 × 3 × 3. It is divisible by the number of prime numbers below it ().. The first non-trivial decagonal number is 27.
twenty-three point three eight billion Often, large numbers are written with (preferably non-breaking ) half-spaces or thin spaces separating the thousands (and, sometimes, with normal spaces or apostrophes ) instead of commas —to ensure that confusion is not caused in countries where a decimal comma is used.
The adjective alter, altera, alterum meaning 'other [of two]' was more frequently used in many instances where English would use 'second'. Ordinal numbers, not cardinal numbers, are commonly used to represent dates, because they are in the format of 'in the tenth year of Caesar', etc. which also carried over into the anno Domini system and ...
Several more prefixes came into use, and were recognised by the 1947 IUPAC 14th International Conference of Chemistry [5] before being officially adopted for the first time in 1960. [ 6 ] The most recent prefixes adopted were ronna- , quetta- , ronto- , and quecto- in 2022, after a proposal from British metrologist Richard J. C. Brown.
[3] Twenty-eight is a harmonic divisor number, [4] a happy number, [5] the 7th triangular number, [6] a hexagonal number, [7] a Leyland number of the second kind [8] (), and a centered nonagonal number. [9] It appears in the Padovan sequence, preceded by the terms 12, 16, 21 (it is the sum of the first two of these). [10]
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In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. One modern method of finding the extra needed symbols is to write ten as the letter A, or A 20, where the 20 means base 20, to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet.