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Composite Numbers
Composite Numbers are some special numbers which have more than 2 factors which consists of at least 1 prime factor.They are often referred as Non-prime Numbers.
4,066 Questions
Are composite numbers closed under addition?
No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.
How many composite numbers are there between 11 and 29?
The composite numbers between 11 and 29 are 12,14,15,16,18,20,21,22,24,25,26,27 & 28.
What numbers are prime and composite 9 16 20 29 33?
29 is prime, all the others in the list are composite.
How many composite numbers are greater than 50 but less than 70?
There are 15 composite numbers greater than 50 but less than 70
What are the 3 undefined terms in geometry and their definition?
Points, lines & planes.
Point - a dot on a page. A point has no dimensions (length, width, height), it is usually represent by a capital letter and a dot on a page. Think of it as an infinitely small place or position on a map.
Line - an unlimited number of points along the same path. The set of points may be straight or form a curve. Normally, the term 'line' means a straight line. The 'line' has no dimensions (length, width, height) and extends unlimited in both directions. (The part of a line defined by two points, called 'endpoints', is call a line segment or 'segment'.) A 'line' is represented by a drawn line with arrowheads on each end to represent that it doesn't have endpoints. A line can be named in two ways: (1) use the capital letters representing two points on the line and place a double-headed arrow above the two letters (2) use a lowercase letter beside the line to represent it.
Plane - a flat surface that extends indefinitely in all directions. It is usually represented by a parallelogram (four sided figure) with a capital letter in one corner. Remember the plane is not limited by the parallelogram, it extends infinitely. The plane can also be represented by using three points that lie on the plane surface but not on the same line (noncollinear).
What is the name of Eratosthenes' method of finding composite numbers?
Eratosthenes' method of finding prime and composite number is called 'The Sieve of Eratosthene'.
What are the composite numbers between 61 to 89?
They are: 62 63 64 65 66 68 69 70 72 74 75 76 77 78 80 81 82 84 85 86 87 88.
What is the smallest composite number that is divisible by 3 5 and 9?
45.
Look at the prime decompositions of all three numbers:
3 = 3
5 = 5
9 = 3 * 3
Then take the "union" of all these compositions, i.e. the minimum number of 3s you need is 2, the minimum number of 5s you need is 1 and for all other primes it is 0. Therefore the smallest number divisible by all numbers is 3*3*5 = 45.
What are all even numbers from 30 to 60?
Even numbers end with a digit of 0, 2, 4, 6 or 8.
The Even numbers from 30 to 60 are:
30, 32, 34, 36, 38, 40, 42, 44, 46,48, 50, 52, 54, 56, 58, 60.
What are the composite numbers between 50 and 75?
All of the whole numbers between 50 and 75 are composite numbers,
except 53, 59, 61, 67, 71, and 73.
What are the divisibility rules of all prime numbers?
The divisibility rules for a prime number is if it is ONLY divisible by 1, and itself.
What do you call one if it is not a prime or composite number?
The property of prime or composite is not defined for the number 1, just as it is not defined for any number that has a fractional part. There are no special names for numbers that are not prime nor composite.
Which numbers between 20 and 30 have the greatest number of factors?
If you include 30, both 24 and and 30 have 8 factors, the most in that range.
What occurs when the composite number is expressed as a number of factors that are all prime?
When a composite number is expressed as a product of its prime factors, the prime factorization of the composite number has been performed.
What are all co prime numbers from 1 500?
It's an enormous list; we wouldn't be able to get them all. All of the prime numbers in that range are co-prime with each other. The composite numbers, as long as they aren't multiples of the primes, are co-prime with the primes. The square numbers are co-prime with each other and quite a few of the composite numbers are co-prime with each other. If you could narrow the range, we could be more specific.
What counting number is neither a prime number nor a composite number?
1 is the counting number that is neither a prime number nor a composite number.
oddcomposite:sum( f(factor(2*k+1))* (primep(2*k+1)-true)/(false-true),k,2,50);
f(99)+f(95)+f(93)+f(91)+f(87)+f(85)+f(81)+f(77)+f(75)+f(69)+f(65)+f(63)+f(57)+f(55)+f(51)+f(49)+f(45)+f(39)+f(35)+f(33)+f(27)+f(25)+f(21)+f(15)+f(9)
conributed by Huen Y.K.
cosmology@pacific.net.sg
