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A244682 The spiral of Champernowne read by the North-Northwest ray. 0
1, 1, 6, 7, 1, 8, 2, 2, 5, 4, 5, 8, 8, 9, 0, 1, 7, 2, 5, 1, 2, 3, 2, 2, 5, 7, 9, 3, 6, 3, 8, 4, 5, 2, 8, 5, 2, 4, 0, 6, 7, 9, 3, 7, 0, 6, 7, 9, 1, 6, 0, 0, 6, 2, 4, 1, 2, 0, 9, 4, 3, 4, 1, 9, 1, 5, 6, 7, 0, 4, 7, 8, 9, 2, 3, 0, 0, 7, 6, 7, 2, 3, 2, 2, 8, 5, 5, 2, 9, 5, 8, 8, 8, 8, 7, 1, 1, 1, 9, 6, 4, 4, 9, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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_] := 16n^2 - 33n + 18 (* see A244677 formula section *); Array[ almostNatural[ f@#, 10] &, 105]

CROSSREFS

Cf. A033307, A033952, A143860, A244677-A244688, A244690-A244692.

Sequence in context: A256128 A280501 A244818 * A201323 A155490 A156918

Adjacent sequences:  A244679 A244680 A244681 * A244683 A244684 A244685

KEYWORD

nonn,easy

AUTHOR

Robert G. Wilson v, Jul 04 2014

STATUS

approved

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Last modified November 12 05:52 EST 2019. Contains 329051 sequences. (Running on oeis4.)