Science quiz
What comes next? 20 number sequences
Five terms are shown and the sixth is yours to find. Squares, primes, doubling and a few that are less obvious.
- Format
- Type them all
- Items
- 20 answers
- Limit
- 5:00
- Level
- Medium
- Checked
- 2026.10.03
- Answers
- 20
- Time limit
- 5:00
- Order
- One at a time, skip allowed
- Matching
- Case and accents ignored
- The highlighted slot is the one to answer.
- Prev and Next skip around; click a slot to jump to it.
- Enter on an empty box skips; the up and down arrow keys step through the slots.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Type the next number in each sequence.
About this quiz
Each sequence follows one simple rule: add a fixed amount, multiply by a fixed amount, or take a well known family of numbers in order. The rule is shown once a row is settled.
- Any five numbers could be continued in many ways; the answer wanted is always the simplest rule.
- The sequence 1, 1, 2, 3, 5 is the Fibonacci sequence.
- Commas in your answer are ignored.
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | The Fibonacci sequence: first 20 numbers Type the first 20 numbers of the Fibonacci sequence in order, starting 1, 1, 2, 3, 5. Each one is the sum of the two before it. Science / Type them all / 20 answers | Science | Type them all | 20 | 2026.10.03 |
| 02 | Triangular numbers: the first 20 1, 3, 6, 10: type the first 20 triangular numbers in order, up to 210. Each one adds the next whole number to the one before. Science / Type them all / 20 answers | Science | Type them all | 20 | 2026.10.03 |
| 03 | Factorials from 1 to 12 1, 2, 6, 24, 120: type the factorials from 1 to 12 in order, up to 479,001,600. One wrong answer ends the run. Science / Type them all / 12 answers | Science | Type them all | 12 | 2026.10.03 |