### Brain Teasers

# 0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, ?, ?, ?, ?

What are the next four terms in this sequence?

0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, ?, ?, ?, ?

0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, ?, ?, ?, ?

### Hint

Think in binary.### Answer

24, 27, 29, 30.In binary, these numbers have digital sums that are even.

For example, 3 is 11 in binary, while 23 is 10111 and 24 is 11000.

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