A geometric sequence is a sequence ,
, 1, ..., such that each term is given by a multiple
of the previous one. Another equivalent
definition is that a sequence is geometric iff it has a zero
series bias. If the multiplier is
, then the
th term is given by
Taking
gives the simple special case
The Season 1 episode "Identity Crisis" (2005) of the television crime drama NUMB3RS mentions geometric progressions.