A319289 - OEIS

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A319289

The x coordinates of the shell enumeration of N X N where N = {0, 1, 2, ...} (A319514).

5

0, 0, 1, 1, 2, 2, 2, 1, 0, 0, 1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,5

COMMENTS

See A319514 for comments and references.

LINKS

Peter Luschny, Table of n, a(n) for n = 0..10000

PROG

(Julia)

function A319289(n)

m = x = isqrt(n)

y = n - x^2

x <= y && ((x, y) = (2x - y, x))

isodd(m) ? y : x

end

CROSSREFS

Sequence in context: A334889 A078336 A076441 * A124747 A334888 A039981

Adjacent sequences: A319286 A319287 A319288 * A319290 A319291 A319292

KEYWORD

nonn

AUTHOR

Peter Luschny, Sep 23 2018

STATUS

approved