If you are interested in Large Powers of 13, you can click one of these...

13^(13^1) | 13^(13^2) | 13^(13^3) | 13^(13^4) | 13^(13^5) | 13^(13^6) | 13^(13^7) |

Source Code | Timings |

If you are curious about what the Square Root of 13 is, you can click one of these...

SQRT(13) | Source Code | Timings |