Document Math
Type mathematical expressions into a buffer and evaluate them with the add command. This feature is
called document math. The add command adds selected text and inserts the result below the last line of
the selection. If no operator exists between two adjacent numbers on the same line, addition is assumed.
The result of each adjacent line is added.
Prime Numbers
Prime numbers are often useful for sizing hash tables. The isprime command (used from the command
line) takes a decimal number as an argument and tells you if it is prime, and if not, its first divisor. The
nextprime command takes a decimal number as an argument and finds the next greater prime number.
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