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%I #12 Jan 06 2017 10:56:01
%S 0,0,0,1,1,2,4,8,6,2,2,9,1,5,8,5,1,1,6,4,3,5,9,3,2,1,6,3,3,4,7,8,4,5,
%T 6,5,2,9,4,2,8,5,1,7,3,7,9,8,9,6,5,1,3,6,6,7,4,5,4,2,6,8,2,9,7,8,8,5,
%U 1,4,9,1,6,2,9,9,8,1,9,9,9,1,1,2,4,8,6,2
%N Digital roots of tetranacci numbers A000078.
%C From a(3) onwards, periodic with period length 78, twice the periodicity of the digital roots of tribonacci numbers A222407 (also the 12th triangular number).
%F a(n) = A010888(A000078(n)).
%Y Cf. A000078, A010888, A222407.
%K nonn,base
%O 0,6
%A _Peter M. Chema_, Jan 02 2017
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