A091995 Permutation of the natural numbers.

1, 2, 3, 4, 5, 7, 6, 8, 11, 9, 12, 16, 10, 13, 17, 22, 14, 18, 23, 29, 15, 19, 24, 30, 37, 20, 25, 31, 38, 46, 21, 26, 32, 39, 47, 56, 27, 33, 40, 48, 57, 67, 28, 34, 41, 49, 58, 68, 79, 35, 42, 50, 59, 69, 80, 92, 36, 43, 51, 60, 70, 81, 93, 106, 44, 52, 61, 71, 82, 94, 107

Offset

1,2

Comments

Write the natural numbers as a triangle:

1

2...3

4...5...6

7...8...9..10

11..12..13..14..15

Now read off the numbers diagonally from upper-right to lower-left. 1 -> 2 -> 3 -> 4 -> 5 -> 7 -> 6 -> 8 -> 11 -> 9 -> 12 -> ...

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

Crossrefs

a(n) = A090894(n-1)+1. Cf. A092180.

Sequence in context: A293052 A273751 A056017 * A343150 A338698 A361946

Adjacent sequences: A091992 A091993 A091994 * A091996 A091997 A091998

Keyword

easy,nonn

Author

Felix Tubiana, Mar 17 2004

Status

approved