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

prime log2 prime
2 1
3 1.584962501
5 2.321928095
7 2.807354922
11 3.459431619
13 3.700439718
17 4.087462841
19 4.247927513
23 4.523561956
29 4.857980995

You can calculate the binary logarithm of n like this

log2(n) = ln(n)/ln(2)