A319290 - OEIS

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A319290

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

5

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

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

OFFSET

0,7

COMMENTS

See A319514 for comments and references.

LINKS

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

PROG

(Julia)

function A319290(n)

m = x = isqrt(n)

y = n - x^2

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

isodd(m) ? x : y

end

CROSSREFS

Sequence in context: A292995 A037179 A127971 * A230516 A192688 A156752

Adjacent sequences: A319287 A319288 A319289 * A319291 A319292 A319293

KEYWORD

nonn

AUTHOR

Peter Luschny, Sep 23 2018

STATUS

approved