| The smallest positive integer that ... | Number | % Correct |
|---|---|---|
| exists | 1 | 100%
|
| is prime | 2 | 100%
|
| is odd and not prime (except 1) | 9 | 100%
|
| is not a Fibonacci number | 4 | 82%
|
| is perfect | 6 | 82%
|
| is the product of two distinct primes | 6 | 82%
|
| is the product of three distinct primes | 30 | 73%
|
| is not a power of a prime number | 6 | 73%
|
| is sublime | 12 | 55%
|
| is an emirp, i.e. a prime number which results in a different prime when the digits are reversed | 13 | 55%
|
| is both a square number and the sum of two positive squares | 25 | 55%
|
| is both a square number and a triangular number (except 1) | 36 | 55%
|
| The smallest number of colours that is needed to colour the regions of any flat map, such that no two adjacent regions have the same colour | 4 | 55%
|
| the sum of its factors is bigger than itself | 12 | 45%
|
| has every number from 2 to 7 as a factor | 420 | 45%
|
| The smallest number of sides of a polygon that cannot be constructed with compass and straightedge | 7 | 45%
|
| The smallest number of turns that is needed to solve any Rubik's cube | 20 | 36%
|
| can be written as the sum of two positive squares in two distinct ways | 50 | 9%
|
| The smallest number of moves to solve any 15-puzzle | 80 | 9%
|