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A068226 Neighbor in 2-1 direction of numbers arranged as clockwise spiral. 2
6, 1, 4, 5, 18, 19, 20, 7, 8, 9, 2, 3, 14, 15, 16, 17, 38, 39, 40, 41, 42, 21, 22, 23, 24, 25, 10, 11, 12, 13, 32, 33, 34, 35, 36, 37, 66, 67, 68, 69, 70, 71, 72, 43, 44, 45, 46, 47, 48, 49, 26, 27, 28, 29, 30, 31, 58, 59, 60, 61, 62, 63, 64, 65, 102, 103, 104, 105, 106, 107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Any offset (x,y) in this spiral is a permutation of the natural numbers.

LINKS

Table of n, a(n) for n=1..70.

F. Ellermann, Some EIS sequences based on a spiral of natural numbers.

Index entries for sequences that are permutations of the natural numbers.

CROSSREFS

n = A068225(A068226(n)). Offset A068225: (+1, 0), A068226: (-1, 0).

Sequence in context: A021865 A198565 A190409 * A011237 A195433 A016534

Adjacent sequences:  A068223 A068224 A068225 * A068227 A068228 A068229

KEYWORD

nonn,easy

AUTHOR

Frank Ellermann, Feb 22 2002

STATUS

approved

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Last modified January 18 13:54 EST 2019. Contains 319271 sequences. (Running on oeis4.)