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

Author

Felix Tubiana, Mar 17 2004

Keywords

• easy
• nonn

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.