Multiplicative function: Difference between revisions

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and therefore ''r''<sub>2</sub>(1) = 4 ≠ 1. This shows that the function is not multiplicative. However, ''r''<sub>2</sub>(''n'')/4 is multiplicative.
 
In the [[On-Line Encyclopedia of Integer Sequences]], [http://oeis.org/search?q=keyword:mult sequences of values of a multiplicative function] have the keyword "mult".<ref>http://oeis.org/search?q=keyword:mult</ref>
 
See [[arithmetic function]] for some other examples of non-multiplicative functions.