Equivalently, a perfect number is a number that is half the sum of all of its positive divisors (including itself) i.e.

Even times odd is even, odd times odd is odd.

In base 10, the number 72 is a Harshad number.

1 is divisible by 71 but 71 is not one more than a multiple of 9, 71 is a Pillai prime.

In mathematics, a Fermat number, named after Pierre de Fermat who first studied them, is a positive integer of the form formula_1where n is a nonnegative integer.

Take a number, any number two.

One definition of exponentiation is that you start with a one, you start with a one, then you multiply this number times a one once.

In base 10, it is a Kaprekar number, and a Harshad number.

The mass number is a simple whole number, and has units of nucleons.

A number logic game

There he attracted a number of students.

man, boy, pot, broom...).

That's an enormous amount of cars.

Miscellaneous Rectilinear the polygon's sides meet at right angles, i.e., all its interior angles are 90 or 270 degrees.

This time, a 1 is carried, and a 1 is written in the bottom row.

Infinite states An automaton that may not have a finite number of states, or even a countable number of states.

A large number of registers requires a large number of instruction bits as register specifiers, meaning less dense code (see below).

Franklin thought of the charge carrier as being positive, but he did not correctly identify which situation was a surplus of the charge carrier, and which situation was a deficit.

To select number one, you can press one or say number one.

The Axiom of Choice is necessary to select a set from an infinite number of socks, but not an infinite number of shoes.

__NOTOC__In number theory, a prime number p is a Sophie Germain prime if 2 p 1 is also prime.

That's a good number to go extinct, I think.

We are facing an unprecedented number, scale of disasters.

It's a very large number of galaxies.

How about a two digit number?

A three digit number, sir, yes?

And it's a number of projects.

Tom has collected a great many butterflies.

There has been an increase in the number of murders.

Is there a mistake in the telephone number?

There's a huge number of people there.

There's a huge number of people there.

I know a lot of good restaurants.

It does not have an opus number.

The Rule of 72 in finance.

In an odd base, the number is even according to the sum of its digits it is even if and only if the sum of its digits is even.

The clique number ω( G ) of a graph G is the number of vertices in a maximum clique in G .

So that's a large number.

Is that a big number?

It was a wrong number.

48 is in base 10 a Harshad number.

It is a Harshad number.

Reverse proxy The above setup caching the contents of an unlimited number of webservers for a limited number of clients is the classical one.

This happens with many, but not all, polynomials of degree 5 or higher.

The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.