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Duplicates in "n times hamming weight" sequence code-golf math sequence binary number-theory
Background
The sequence in the title is A245788 "n times the number of 1's in the binary expansion of n", which starts like this:
1, 2, 6, 4, 10, 12, 21, 8, 18, 20,
33, 24, 39, 42, 60, 16, 34, 36, 57, 40,...