yes
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yes! just think of it this way: when someone tells you start counting, you "naturally" start with 1, 2, 3, 4, 5,...and so on. that's helps you remember the words natural numbers, because you "naturally" start counting at 1. it's the same with counting numbers. if someone told you to start counting, you would start with 1, 2, 3, 4, 5,...and so on. this helps you remember counting numbers, because you start "counting" with 1. get it??! =D
There are infinite prime numbers as there is infinite numbers. You cannot limit the counting of primes.
These are known as integers.
The negative Fibonacci numbers (also known as the Negafibonacci numbers) consist of the Fibonacci numbers in an alternating negative and positive pattern.The start of the Negafibonacci sequence runs thus:1, -1, 2, -3, 5, -8, 13, -21...And continues in a pattern identical to the Fibonacci numbers but with alternating negative and positive numbers.
Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".