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Numbers

Numbers are our way to quantify, label, and organize the world around us in a logical manner. However, the systems used to obtain this goal differ geographically, historically, and by relative utility. All questions pertaining to numbers, including historic labeling systems, bases of numerical systems, constants, and the various ways they're grouped together, should be placed into this category.

46,867 Questions

How do you write 390635 in word form?

Three hundred ninety thousand, six hundred thirty-five.

Is there an algorithm that yields only prime numbers?

What exactly do you mean "yields only prime numbers"?

If you mean a formula that when given the numbers n=1, 2, 3, ... and so on generates the nth prime number (or a different prime number for each n) then no.

If you mean an algorithm whereby a number can be tested to be a prime number then yes.

(Using this prime_test algorithm, a simple algorithm can be written that would supply numbers one at a time to it and use its result to decide whether to yield the tested number or not, only yielding those numbers which pass the test.)

Does negative 2 correspond with 5?

Negative 2 does not correspond to 5 in any way. Negative 5 might be seen as a mirror image of 5 on the number line, but negative 2 has no correlation to 5.

All odd numbers?

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 pretty much anything ending with 1 3 5 7 9

Prime numbers do not have any factors?

A prime number has two factors: one and the number itself. A prime number does not have any proper factors.

1-100 all the prime numbers?

the prime numbers from 1-100 are

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

Are All square numbers even numbers?

No; most are not, not even close. 2 is not a square, 6 is not a square, 8 is not a square, 10 is not a square, 12 is not a square, and 14 is not a square, just for starters.

Only a very small proportion of even numbers are squares: 4, 16, 36, 64, 100, 144, 196, 256, 324, 400....