Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | " Pilot " | Danny Cannon | Craig Silverstein | September9,2010 | 276051 | 3.57 |
| 2.0 | "2.0" | Danny Cannon | David Levinson & Craig Silverstein | September16,2010 | 3X6252 | 3.19 |
| 3.0 | "Kill Jill" | David Solomon | Amanda Segel | September23,2010 | 3X6253 | 3.15 |
| 4.0 | "Rough Trade" | Nick Copus | Carlos Coto | September30,2010 | 3X6254 | 2.68 |
| 5.0 | "The Guardian" | David Solomon | Albert Kim | October7,2010 | 3X6255 | 2.90 |
| 6.0 | "Resistance" | Guy Ferland | Kalinda Vazquez | October21,2010 | 3X6256 | 2.81 |
| 7.0 | "The Recruit" | Eagle Egilsson | Amanda Segel | October28,2010 | 3X6257 | 2.48 |
| 8.0 | "Phoenix" | David M. Barrett | Jim Barnes | November4,2010 | 3X6258 | 2.41 |
| 9.0 | "One Way" | Ken Fink | Albert Kim | November11,2010 | 3X6259 | 2.33 |
| 10.0 | "Dark Matter" | Danny Cannon | Carlos Coto | December2,2010 | 3X6260 | 2.30 |
| 11.0 | "All the Way" | Terrence O'Hara | Craig Silverstein | December9,2010 | 3X6261 | 2.29 |
| 12.0 | "Free" | Jonathan Glassner | Kalinda Vazquez | January27,2011 | 3X6262 | 2.62 |
| 13.0 | "Coup de Grace" | Nathan Hope | Albert Kim | February3,2011 | 3X6263 | 2.40 |
| 14.0 | "The Next Seduction" | David Solomon | Carlos Coto | February10,2011 | 3X6264 | 1.89 |
| 15.0 | "Alexandra" | Ken Fink | Andrew Colville | February17,2011 | 3X6265 | 2.10 |
| 16.0 | "Echoes" | Nick Copus | Kristen Reidel | February24,2011 | 3X6266 | 2.14 |
| 17.0 | "Covenants" | Eagle Egilsson | Jim Barnes | April7,2011 | 3X6267 | 1.82 |
| 18.0 | "Into the Dark" | Jeffrey Hunt | Albert Kim | April14,2011 | 3X6268 | 2.21 |
| 19.0 | "Girl's Best Friend" | Robert Lieberman | Carlos Coto | April21,2011 | 3X6269 | 2.01 |
| 20.0 | "Glass Houses" | Ralph Hemecker | Kalinda Vazquez | April28,2011 | 3X6270 | 1.72 |
| 21.0 | "Betrayals" | Eagle Egilsson | Andrew Colville | May5,2011 | 3X6271 | 2.00 |
Question:
Name the least number for production code 3x6266
Answer:
16.0