Numbers whose base-16 representation has an even number of runs.

3

`%I #10 Jun 18 2021 23:03:47
`

`%S 16,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,35,36,37,38,39,40,
`

`%T 41,42,43,44,45,46,47,48,49,50,52,53,54,55,56,57,58,59,60,61,62,63,64,
`

`%U 65,66,67,69,70,71,72,73,74,75,76,77,78,79
`

`%N Numbers whose base-16 representation has an even number of runs.
`

`%o (Python)
`

`%o from itertools import groupby
`

`%o def ok(n): return len(list(g for k, g in groupby(hex(n)[2:])))%2 == 0
`

`%o print(list(filter(ok, range(1, 80)))) # _Michael S. Branicky_, Jun 18 2021
`

`%K nonn,base
`

`%O 1,1
`

`%A _Clark Kimberling_
`

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