# What is a compound number?

## What is a compound number?

: a number (such as 2 feet 5 inches) involving different denominations or more than one unit.

Is 1 a compound number?

1 is not a composite number because the sole divisor of 1 is 1. The positive integers 2 and 3 are prime numbers because it can be divided by only two factors, one and itself.

### What is Coprime number?

A Co-prime number is a set of numbers or integers which have only 1 as their common factor i.e. their highest common factor (HCF) will be 1. Co-prime numbers are also known as relatively prime or mutually prime numbers.

What is complete number?

Complete numbers: A positive number is said to be complete if the sum of all positive divisors of the number is equal to twice the number itself. For example, 6 is the first positive complete number. Therefore, the sum of the divisors = 1 + 2 + 3 + 6 = 12 = 2 × 6.

## Which is the smallest prime number?

The first 1000 prime numbers

1 11
1–20 2 31
21–40 73 127
41–60 179 233
61–80 283 353

What two prime numbers have the sum of 16?

3+13 gives the answer of 16.

### What is the formula for finding prime numbers?

Every prime number can be written in the form of 6n + 1 or 6n – 1 (except the multiples of prime numbers, i.e. 2, 3, 5, 7, 11), where n is a natural number.

What is the fastest way to find a prime number?

Prime sieves A prime sieve or prime number sieve is a fast type of algorithm for finding primes. There are many prime sieves. The simple sieve of Eratosthenes (250s BCE), the sieve of Sundaram (1934), the still faster but more complicated sieve of Atkin, and various wheel sieves are most common.

## What are prime numbers give 10 examples?

The first ten primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

What is the sum of prime numbers?

How to find the sum of prime numbers up to a prime number n, that is for example: the sum of prime numbers up to 7 is: 2+3+5+7=17. with pk being the kth prime. Also if we have the sum of an even number of primes then would it be a new prime? Example: 2+3+5+7=17 and 17 is a prime.

### What is the sum of two prime numbers?

The sum of two prime numbers is not always even. Because of every prime number is an odd number except 2, However, adding two odd numbers always results in an even number. If you add any prime numbers with 2 it will be odd. The sum of two prime numbers except 2, are always even.

What is the sum of all prime numbers between 30 to 60?

311

## What is the sum of first 5 prime numbers?

the 1st 5 prime no. s are —– 2,3,5,7,11. now the sum is — 2+3+5+7+11=28………… hope it helps!!!!!!!

What is the sum of the first 4 prime numbers?

ANSWER: The sum of the first four prime numbers is 17.

### What is the sum of the first prime numbers?

Correct answer: The first seven primes are 2, 3, 5, 7, 11, 13, and 17. Don’t forget about 2, the smallest prime number, and also the only even prime! Adding these seven numbers gives a sum of 58, and 58/2 = 29.

What is the sum of first 100 even numbers?

The number series 2, 4, 6, 8, 10, 12, . . . . , 200. Therefore, 10100 is the sum of first 100 even numbers.

## What is the formula for sum of odd numbers?

Sum of first odd number = 1. Sum of first two odd numbers = 1 + 3 = 4 (4 = 2 x 2). Sum of first three odd numbers = 1 + 3 + 5 = 9 (9 = 3 x 3). Sum of first four odd numbers = 1 + 3 + 5 + 7 = 16 (16 = 4 x 4).

What is the sum of n even numbers?

Sum of first n even numbers = n * (n + 1).

### What is the formula for the sum of consecutive numbers?

Using the Formula (n / 2)(first number + last number) = sum, where n is the number of integers.

How do you find the sum of n numbers?

Sum of First n Natural Numbers. We prove the formula 1+ 2+ + n = n(n+1) / 2, for n a natural number.

## What is Gauss formula?

Gauss’s method forms a general formula for the sum of the first n integers, namely that 1+2+3+\ldots +n=\frac{1}{2}n(n+1) One way of presenting Gauss’ method is to write out the sum twice, the second time reversing it as shown. If we add both rows we get the sum of 1 to n, but twice.

What is the sum of two consecutive odd numbers?

The sum of any two consecutive numbers is always odd. Example, 4 + 5 = 9; –8 + (–7) = –15.

### What is the sum of 3 consecutive odd numbers?

The three consecutive odd numbers whose sum is 27 are 7, 9 and 11….Thank you.

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Can the sum of three consecutive odd numbers be 36 Why?

36 is not odd number. No solution.

## Why is the sum of two consecutive numbers always odd?

But if you add two consecutive numbers, the answer is always an odd number. So a sum like this must have an odd number as a factor again – but 2^n doesn’t. This proves that an even number of consecutive numbers cannot add to make 2^n.

What is the sum of consecutive odd counting number from 1 to 35?

The number series 1, 3, 5, 7, 9, . . . . , 69. Therefore, 1225 is the sum of first 35 odd numbers.

### Can the sum of 9 consecutive numbers be 58?

A similar approach shows that 58 cannot be the sum of eight, nine, or ten whole numbers.