That's the power to which a base must be raised to produce a given number - see the related link below:
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You take the logarithm of each term.
Assuming you mean 'logarithm to the base 'e' ( natural logarithm. On the calculator its symbol is 'ln'. Hence ;ln 2 = 0.69314718....
anti logarithm
The logarithm of 1.5 is approximately 0.1760912591... Your logarithm is base 10, and the natural logarithm of 1.5 (base e), is approximately 0.4054651081... Example base: 8 Approximately: 0.1949875002...
Especially if the 2 is written as a subscript, it means the base-2 logarithm.