A387544 Even terms of A386482, halved, in order of occurrence.

1, 2, 3, 6, 5, 4, 7, 9, 8, 10, 15, 14, 13, 12, 11, 18, 17, 16, 19, 27, 26, 25, 24, 23, 22, 21, 20, 30, 29, 28, 34, 33, 32, 31, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 46, 47, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50

Offset

1,2

Comments

Each record in the sequence is followed by the smaller missing terms in descending order.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10306

Rémy Sigrist, PARI program

Formula

a(a(n)) = n.

Example

The first terms, alongside the first terms of A386482, are:
  k   A386482(k)  n   a(n)
  --  ----------  --  ----
   1           1
   2           2   1     1
   3           4   2     2
   4           6   3     3
   5           3
   6           9
   7          12   4     6
   8          10   5     5
   9           8   6     4
  10          14   7     7
  11           7
  12          21
  13          18   8     9
  14          16   9     8
  15          20  10    10

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A386482, A387558.

Sequence in context: A122308 A122307 A188568 * A383589 A354224 A305418

Adjacent sequences: A387541 A387542 A387543 * A387545 A387546 A387547

Keyword

nonn

Author

Rémy Sigrist, Sep 01 2025

Status

approved