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NextPrime

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NextPrime[n]

gives the next prime after n.

NextPrime[n,k]

gives the kth prime after n.

• • NextPrime[100]

The the first number does not have to be an integer:

• • NextPrime[100.5, 2]

However, when the second value, the step value is not an integer is given, we do nothing:

• • NextPrime[100, 2.5]

With a negative number, we find a prime number before the given number:

• • NextPrime[100, -1]

And with negative counts, it is possible to get negative prime numbers:

• • NextPrime[2, -1]