General forms of a sequence

Arithmetic and geometric sequences

Arithmetic formula: an=a1(n+1)d

Geometric formula: an=a1*r(n-1)

A sequence is a list of numbers

Geometric example:
2,4,8,16,32,64
They all are divided by 2

Arithmetic example:
2,4,6,8,10,12,14
They are all +2