Nico Rosberg is yet to decide whether he will use the No. 1 reserved for Formula 1 world champions in 2017, having used No. 6 through his title-winning campaign.
Permanent numbers were introduced to F1 for the 2014 season, with the No. 1 being reserved for the defending world champion should they choose to use it.
Sebastian Vettel ran with the No. 1 through 2014, with his preferred choice, No. 5, being reserved for when he was not world champion.
Lewis Hamilton has opted to pass on the offer to use the No. 1 through 2015 and 2016, having won the past two titles, and instead stuck with his traditional No. 44.
Rosberg claimed his maiden F1 World Championship on Sunday in Abu Dhabi, defeating Hamilton by five points in a nail-biting finale.
Rosberg has raced with No. 6 since permanent numbers were introduced, and is yet to decide on whether he will make use of the No. 1 for 2017.
“I have no idea,” Rosberg said when asked what number he would use.
“I love number six of course, my dad won the World Championship with number six as well, so it’s a very lucky number for us.
“Don’t know, that’s it.”
Rosberg will be the first F1 driver to make a decision about using the No. 1 without having previously used it, with both Vettel and Hamilton running the number before the new system was introduced in 2014.
A similar choice regarding use of the No. 1 is given to drivers in IndyCar, with Scott Dixon sticking with his No. 9 for the 2016 season despite winning the 2015 title. Simon Pagenaud is expected to race with the No. 1 in 2017 as defending champion.