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The Nth Prime Page Nth prime through n=10^12, pi(x) through x=3*10^13, Random primes in same range. Interface to a list of the first 98 million primes (primes less than 2,000,000,000) Weisstein, Eric W. "Prime Number Sequences". MathWorld. Selected prime related sequences in OEIS.
78 is: the 5th discrete tri-prime; or also termed Sphenic number, and the 4th of the form (2.3.r). [1] an abundant number with an aliquot sum of 90; within an aliquot sequence of nine composite numbers (78, 90,144,259,45,33,15,9,4,3,1,0) to the Prime in the 3-aliquot tree. a semiperfect number, as a multiple of a perfect number.
In mathematics, a multiple is the product of any quantity and an integer. [1] In other words, for the quantities a and b, it can be said that b is a multiple of a if b = na for some integer n, which is called the multiplier. If a is not zero, this is equivalent to saying that / is an integer.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
The first: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 (sequence A005843 in the OEIS). An odd number does not have the prime factor 2. The first: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 (sequence A005408 in the OEIS). All integers are either even or odd. A square has even multiplicity for all prime factors (it is of the form a 2 for some a).
Demonstration, with Cuisenaire rods, of the abundance of the number 12. In number theory, an abundant number or excessive number is a positive integer for which the sum of its proper divisors is greater than the number.
Last week, the Electric Reliability Council of Texas asked Texans twice to set their thermostats to 78 degrees and avoid using large appliances during peak hours.
Under this method, an item with a usable life of n = 4 years would lose 4 / 10 of its "losable" value in the first year, 3 / 10 in the second, 2 / 10 in the third, and 1 / 10 in the fourth, accumulating a total depreciation of 10 / 10 (the whole) of the losable value.