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%I #12 Apr 21 2021 04:23:59
%S 1,2,3,4,25,31,37,43,49,50,56,62,68,74,75,81,87,93,99,100,106,112,118,
%T 124,126,127,128,129,185,186,188,189,215,216,217,219,245,246,247,248,
%U 251,252,253,254,280,282,283,284,340,341,342
%N Numbers whose base-5 run lengths alternate: odd, even, odd, ...
%Y Cf. A007091.
%K nonn,base
%O 1,2
%A _Clark Kimberling_