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A244691 The spiral of Champernowne read by the Southeast ray. 2
1, 9, 7, 9, 5, 5, 9, 1, 1, 1, 3, 2, 2, 9, 3, 3, 9, 4, 4, 3, 5, 6, 1, 7, 8, 3, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 7, 7, 9, 3, 9, 0, 0, 3, 1, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..105.

FORMULA

See A244677 formula section.

EXAMPLE

See A244677 for the spiral of David Gawen Champernowne.

MATHEMATICA

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_] := 4n^2 - 4n + 1 (* see A244677 formula section *); Array[ almostNatural[ f@#, 10] &, 105]

CROSSREFS

Cf. A033307, A016754, A033952, A244677-A244688, A244690, A244692.

Sequence in context: A199048 A094132 A243263 * A121911 A010547 A011405

Adjacent sequences:  A244688 A244689 A244690 * A244692 A244693 A244694

KEYWORD

nonn,easy

AUTHOR

Robert G. Wilson v, Jul 04 2014

STATUS

approved

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Last modified October 20 12:43 EDT 2021. Contains 348108 sequences. (Running on oeis4.)