Rookie Kevin Magnussen is the latest driver to nominate his preferred permanent race number.
Making his Twitter debut, the day after his team announced the launch date of its 2014 contender (24 January), the Dane wrote: "Here's some news: my driver number will be 20 this year, which I won the Formula Renault 3.5 Series title with last year."
Last week, Romain Grosjean took to Facebook to reveal that his preferred number is 8 - his race number in 2013 - with 29 and 11 his back-up selections.
Though nobody else has, as yet, opted for 29, Grosjean's third choice (11) is the preferred number for Sergio Perez.
I the wake of the FIA's announcement that from this season drivers will be able to select permanent race numbers for the duration of their F1 careers, Fernando Alonso revealed that his preferred option is 14.
Nico Rosberg is hoping to use 6, while the first choices of other drivers include 19 (Massa), 25 (Vergne) and 77 (Bottas).