7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 ....
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In principle, you can count backwards; or use some shortcut (such as calculating the number of days, dividing by 7, and obtaining the remainder).
The examiner may be assessing your cognitive ability. If you can't do it then you may be impaired or have trouble reasoning.
If you counted 1 number per second, it would take 220 years to count to 7 billion.
The number 77 is a palindrome because it can be read the same way either forward or backwards; it is also a multiple of 7.
7,14,21,28,35