Basic Examples (2)
Find the arithmetic derivative of 100:
Find the arithmetic derivative of the fraction :
Scope (2)
Arithmetic derivate for any prime is 1:
Using Leibniz rule it is easy to find the formula for prime tower :
which is the same as :
Properties and Relations (4)
Higher order arithmetic derivatives are defined successively by nesting the same operation multiple times:
Arithmetic derivative of an integer n has the following bounds: , where is PrimeOmega[n] and gives the number of prime factors counting multiplicities.
The equality of the lower bound holds if and only if :
The equality of the upper bound holds if and only if n is prime or a prime tower:
if and only if where p is any prime:
It is easy to see that is not a fixed point:
has nontrivial solution for some rational value x:
Possible Issues (2)
The arithmetic derivative does not obey linearity in general:
Clearly 1 is not same as :
However, if we find some m and n such that , then for all integer k. For instance:
Then the following also true:
Neat Examples (4)
The graph of for
We can define the arithmetic integral by solving the equation given a, . The algorithm can be implemented with simple search in the interval found in the aforementioned bounds:
For example, the integrals of 10 and 100:
We also can find the a's that do not have their integrals less than 1000:
Here is a list of number with more than one integral:
The result means that 10 has two integrals, 12 has two integrals and so on.
The Goldbach conjecture implies that the differential equation has a positive integer solution for any natural number :
For instance as a sum of two primes:
By the Leibniz rule of arithmetic derivative, 35 is one solution for n such that the differential equation holds:
Twin prime conjecture implies that the differential equation has infinite number of solutions:
This is from the application of Leibniz rule on the arithmetic derivative of where p is any prime:
In general, . If is a prime again,
Thus we shall have infinite such if the conjecture holds.