Ruby exercise.
Requires Ruby >= 2.1 - tests are based on minitest, no gems required.
ruby script.rb [--count 15]
Sample output:
» ruby script.rb --count 8
| 2 3 5 7 11 13 17 19
----+--------------------------------
2 | 4 6 10 14 22 26 34 38
3 | 6 9 15 21 33 39 51 57
5 | 10 15 25 35 55 65 85 95
7 | 14 21 35 49 77 91 119 133
11 | 22 33 55 77 121 143 187 209
13 | 26 39 65 91 143 169 221 247
17 | 34 51 85 119 187 221 289 323
19 | 38 57 95 133 209 247 323 361
rake test