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A184403 "Types" (parities of i and j) when all the numbers i+j*r are ranked, where r=sqrt(2), i>=0, j>=0. 7
4, 2, 3, 4, 1, 4, 2, 3, 2, 4, 3, 1, 4, 2, 1, 3, 4, 2, 4, 3, 1, 2, 4, 2, 3, 1, 3, 4, 2, 4, 1, 3, 1, 4, 2, 4, 2, 3, 1, 3, 2, 4, 2, 3, 4, 1, 3, 1, 4, 2, 4, 1, 2, 3, 1, 4, 3, 2, 4, 2, 3, 4, 1, 3, 2, 1, 4, 2, 3, 4, 1, 2, 3, 1, 4, 3, 2, 4, 1, 2, 3, 4, 1, 4, 3, 2, 1, 4, 2, 3, 4, 1, 2, 3, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..96.

FORMULA

Let s(n)=i(n)+r*j(n) be the sequence obtained by arranging in increasing order all the numbers i+j*r, where

  r=2^(1/2) and i>=0, j>=0.  Then

a(n)=1 if i(n) is odd and j(n) is odd (n in A184399);

a(n)=2 if i(n) is odd and j(n) is even (n in A184400);

a(n)=3 if i(n) is even and j(n) is odd (n in A184401);

a(n)=4 if i(n) is even and j(n) is even (n in A184402).

EXAMPLE

(See the examples at A184399-A184402.)

CROSSREFS

Cf. A183993, A184338, A184397, A184398, A184399, A184400, A184401, A184402.

Sequence in context: A118945 A016692 A183993 * A198120 A001390 A180343

Adjacent sequences:  A184400 A184401 A184402 * A184404 A184405 A184406

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 12 2011

STATUS

approved

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Last modified May 26 03:48 EDT 2019. Contains 323579 sequences. (Running on oeis4.)