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%I #11 May 19 2023 19:57:59
%S 3968,4168,4208,4216,5168,5208,5216,5408,5416,5456,10168,10208,10216,
%T 10408,10416,10456,11408,11416,11456,11656,16468,16668,16708,16716,
%U 17668,17708,17716,17908,17916,17956,18968,19168
%N Numbers whose base-5 representation contains exactly three 1's and three 3's.
%Y Cf. A007091.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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