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 A091995 Permutation of the natural numbers. 4

%I

%S 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,

%T 25,31,38,46,21,26,32,39,47,56,27,33,40,48,57,67,28,34,41,49,58,68,79,

%U 35,42,50,59,69,80,92,36,43,51,60,70,81,93,106,44,52,61,71,82,94,107

%N Permutation of the natural numbers.

%C Write the natural numbers as a triangle:

%C 1

%C 2...3

%C 4...5...6

%C 7...8...9..10

%C 11..12..13..14..15

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

%H Ivan Neretin, <a href="/A091995/b091995.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

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

%K easy,nonn

%O 1,2

%A Felix Tubiana (fat2(AT)columbia.edu), Mar 17 2004

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Last modified June 15 15:16 EDT 2021. Contains 345049 sequences. (Running on oeis4.)