PrimePowerQ[expr] yields True if expr is a power of a prime number, and yields False otherwise.

Primes represents the domain of prime numbers, as in x \[Element] Primes.

LibraryFunction[args] represents a function that has been loaded from a Wolfram Library.

CarmichaelLambda[n] gives the Carmichael function \[Lambda](n), defined as the smallest integer m such that k^m \[Congruent] 1 mod n for all k relatively prime to n.

LibraryFunctionError[name, code] represents an error returned from a LibraryFunction.

MatchQ[expr, form] returns True if the pattern form matches expr, and returns False otherwise.

CUDAFunctionInformation[fun] returns information about a CUDAFunction.

Many programs you write will involve operations that need to be iterated several times. Nest and NestList are powerful constructs for doing this. Applying functions of one ...

Pure functions. When you use functional operations such as Nest and Map, you always have to specify a function to apply. In all the examples above, we have used the "name" of ...

SpanCharacterRounding is an option for selections that specifies the method used for rounding a spanning character when its size is to be adjusted.