How do you write a sequence in math?

Answer 1

Usually a sequence is written using subscripts to represent a number in the sequence. Example:

The sequence 1, 7, 13, 19, 25 is by adding six each time.

So we can write it as:

a_0 = 1

a_1 = 7

a_(n) = a_(n-1) + 6, where n is the subscript.