What’s the following quantity within the following sequence:

1, 3, 6, 7, 9, 11, 13, 14, 18, 21, 23, 28, 31, ___, …

Not positive if this one is straightforward. Hints can be launched progressively. First one is within the title 🙂

Hint #2

Depending on the place you reside, you will have by no means seen these numbers.

Additionally

Never seeing these numbers is actually a bonus, not drawback.

Hint #3

No math concerned (apart from counting)

Hint #4

Human mind is probably not sufficient. Ask Google or Wikipedia for assist.

Final Hint

How do you seek for a sequence in Google that you’ve got by no means seen, and even has by no means existed? Google shouldn’t be that highly effective to search out one thing nonexistent for you. You have to seek for one thing else.