| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| hardest math problem ever solved | 0.62 | 0.5 | 6836 | 18 |
| hardest math problem ever unsolved | 0.22 | 0.2 | 7888 | 72 |
| hardest math problem ever unsolved in world | 1.23 | 0.1 | 1416 | 13 |
| what is the hardest math problem ever solved | 1.55 | 0.3 | 581 | 58 |
| hardest math problem ever | 0.9 | 1 | 6402 | 24 |
| hardest solved math problem | 1.77 | 0.4 | 7094 | 64 |
| greatest unsolved math problems | 0.63 | 0.8 | 8500 | 12 |
| hardest math problem to solve | 1.9 | 1 | 2202 | 55 |
| hardest math equation unsolved | 1.86 | 0.5 | 8249 | 56 |
| biggest unsolved math problems | 1.45 | 0.6 | 6185 | 82 |
| top 10 unsolved math problems | 0.05 | 0.7 | 9487 | 82 |
| great unsolved math problems | 1.94 | 0.6 | 6358 | 37 |
| most important unsolved math problems | 1.75 | 0.1 | 7767 | 99 |
