Numb3rs - Season 1 - Eps 5: Prime Suspect
When a five-year-old girl is kidnapped from her birthday party, Don and Terry lead the investigation, but must rely on Charlie's help because the girl's father, Ethan, is also a mathematician. Charlie realizes the kidnapper's motive when Ethan reveals he is close to solving Riemann's Hypothesis, a difficult math problem. If solved, the solution could not only earn him $1 million, but could break the code for internet security and unlock the world's biggest financial secret.
About Numb3rs

Title: Numb3rs
First Air Date: 2005-01-23
Last Air Date: 2010-03-12
Status: Canceled
Rating: 7/10 (from 383 votes)
Language: EN
Seasons: 7
Total Episodes: 118
Network: CBS
Genres: Crime, Drama, Mystery
Production Companies: Scott Free Productions
Synopsis
Inspired by actual cases and experiences, Numb3rs depicts the confluence of police work and mathematics in solving crime as an FBI agent recruits his mathematical genius brother to help solve a wide range of challenging crimes in Los Angeles from a very different perspective.
Cast

Rob Morrow
Don Eppes

David Krumholtz
Charlie Eppes

Judd Hirsch
Alan Eppes

Alimi Ballard
David Sinclair

Peter MacNicol
Larry Fleinhardt

Navi Rawat
Amita Ramanujan

Aya Sumika
Liz Warner

Sophina Brown
Nikki Betancourt

Dylan Bruno
Colby Granger