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%I #11 Apr 17 2020 02:50:35
%S 1,1,1,1,1,1,3,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,
%T 1,2,1,1,1,1,2,2,2,2,5,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,
%U 1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1
%N Length of n-th run of digit 3 in A031219.
%K nonn,base
%O 1,7
%A _Clark Kimberling_
%E a(84) corrected by _Sean A. Irvine_, Apr 16 2020