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12 (twelve) is the natural number following 11 and preceding 13.. Twelve is the 3rd superior highly composite number, [1] the 3rd colossally abundant number, [2] the 5th highly composite number, and is divisible by the numbers from 1 to 4, and 6, a large number of divisors comparatively.
The typical dental formula is: 3.1.4.2 3.1.4.2, but the number may be reduced, although never to the same extent as in the Felidae. [4] Their flesh-shearing carnassial teeth are relatively undeveloped compared to those of other feliform carnivorans. [6] Most viverrid species have a penis bone (a baculum). [7]
1. When counting, the number names for 1 and 2 have the forms given in the table; however, when used in a sentence, they change according to the gender of the noun they modify or replace. It is worth noting that the two adjectival forms of the cardinal number for 1 (un and o) are identical with the corresponding indefinite articles.
1 (one, unit, unity) is a number, numeral, and glyph.It is the first and smallest positive integer of the infinite sequence of natural numbers.This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a ...
For example, 2 × 3 2 × 29 × 823 = 429606 is practical, because the inequality above holds for each of its prime factors: 3 ≤ σ(2) + 1 = 4, 29 ≤ σ(2 × 3 2) + 1 = 40, and 823 ≤ σ(2 × 3 2 × 29) + 1 = 1171. The condition stated above is necessary and sufficient for a number to be practical.
The smallest odd integer with abundancy index exceeding 3 is 1018976683725 = 3 3 × 5 2 × 7 2 × 11 × 13 × 17 × 19 × 23 × 29. [8] If p = (p 1, ..., p n) is a list of primes, then p is termed abundant if some integer composed only of primes in p is abundant. A necessary and sufficient condition for this is that the product of p i /(p i − ...
For example, a vampire number in base 12 is 10392BA45768 = 105628 × BA3974, where A means ten and B means eleven. Another example in the same base is a vampire number with three fangs, 572164B9A830 = 8752 × 9346 × A0B1. An example with four fangs is 3715A6B89420 = 763 × 824 × 905 × B1A. In these examples, all 12 digits are used exactly once.
In mathematics, the infinite series 1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1.