The prime numbers
Rule
Each term is: The nth prime
Known as: The prime numbers
Prime numbers are numbers that do not have any divisor apart from one or themselves.
Another way of putting it is that n is prime if that number of objects cannot be arranged into a rectangle, as shown in the illustration.
The first 50 terms (starting from n=1) are:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229
Example
To get the value for n=11:
- Find the eleventh prime, giving 31.
So the result is 31.