Log2
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The symbols log2, lb or ld are used for the binary logarithm, also called dual logarithm.
Log2 of the first primes[edit]
| prime | log2 prime |
|---|---|
| 2 | 1 |
| 3 | 1.5849625007212 |
| 5 | 2.3219280948874 |
| 7 | 2.8073549220576 |
| 11 | 3.4594316186373 |
| 13 | 3.7004397181411 |
| 17 | 4.0874628412503 |
| 19 | 4.2479275134436 |
| 23 | 4.523561956057 |
| 29 | 4.8579809951276 |
| 31 | 4.9541963103869 |
You can calculate the binary logarithm of n like this
log2(n) = ln(n)/ln(2)
Which works in MediaWiki: 1200*log2(5/4) ─→ {{#expr: 1200*(ln(5/4)/ln(2))}} ─→ 386.31371386483