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%I #8 Nov 14 2012 18:08:33
%S 0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,1,2,1,2,1,2,1,3,1,2,2,
%T 2,1,3,1,3,2,2,1,4,1,2,2,4,1,3,1,3,3,2,1,5,2,4,3,4,2,5,3,6,3,3,2,7,2,
%U 3,5,6,3,5,2,4,3,6,3,9,2,3,4,4,4,6,3,8,4,3,2
%N Number of 7's when n is written in base b for 2<=b<=n+1.
%t f[n_] := Count[Flatten@ Table[ IntegerDigits[n, b], {b, 2, n + 1}], 7]; Array[f, 90] (* _Robert G. Wilson v_, Nov 14 2012 *)
%Y Cf. A033093, A033095, A033097, A033099, A033101, A033103, A033105, A033108, A033109, A033111.
%K nonn,base
%O 1,23
%A _Clark Kimberling_
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