A244692 - OEIS

%I #6 Jul 05 2014 17:08:44

%S 1,1,0,6,1,8,2,2,9,4,5,6,7,9,0,5,3,1,5,8,2,2,1,5,9,2,9,4,4,3,8,6,7,4,

%T 8,1,8,5,9,9,7,6,2,9,4,8,6,3,9,9,0,1,0,6,7,1,1,2,5,8,3,1,4,4,9,5,1,6,

%U 3,0,7,1,8,2,1,0,2,1,1,2,2,2,3,0,3,5,2,6,9,4,8,2,9,8,5,0,3,2,7,6,4,3,5,6,7

%N The spiral of Champernowne read by the East-Southeast ray.

%F See A244677 formula section.

%e See A244677 for the spiral of David Gawen Champernowne.

%t almostNatural[n_, b_] := Block[{m = 0, d = n, i = 1, l, p}, While[m <= d, l = m; m = (b - 1) i*b^(i - 1) + l; i++]; i--; p = Mod[d - l, i]; q = Floor[(d - l)/i] + b^(i - 1); If[p != 0, IntegerDigits[q, b][[p]], Mod[q - 1, b]]]; f[n_] := 16n^2 - 39n + 24 (* see A244677 formula section *); Array[ almostNatural[ f@#, 10] &, 105]

%Y Cf. A033307, A143855, A033952, A244677-A244688, A244690, A244691.

%K nonn,easy

%O 1,4

%A _Robert G. Wilson v_, Jul 04 2014