A329127 Lexicographically earliest sequence of distinct positive integers such that the concatenation of the odd-indexed terms equals the concatenation of the even-indexed terms.

1, 11, 12, 2, 3, 31, 13, 32, 21, 14, 4, 5, 51, 15, 52, 22, 23, 33, 34, 41, 16, 6, 7, 71, 17, 72, 24, 42, 25, 53, 35, 54, 43, 36, 61, 18, 8, 9, 91, 19, 92, 26, 62, 27, 73, 37, 74, 44, 45, 55, 56, 63, 38, 81, 110, 10, 20, 201, 111, 112, 28, 82, 29, 93, 39, 94

Offset: 1

Author

Rémy Sigrist, Nov 05 2019

Keywords

• nonn
• base

Comments

Leading zeros are ignored.

Examples

			The first terms of the odd and even bisections are:
    +------+-+---+-+---+---+-+---+---+---+---+---+-+---+---+---+---+---+---+
    | odd  |1|1 2|3|1 3|2 1|4|5 1|5 2|2 3|3 4|1 6|7|1 7|2 4|2 5|3 5|4 3|6 1| ...
    +------+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | even |1 1|2|3 1|3 2|1 4|5|1 5|2 2|3 3|4 1|6|7 1|7 2|4 2|5 3|5 4|3 6|1 8| ...
    +------+---+-+---+---+---+-+---+---+---+---+-+---+---+---+---+---+---+---+
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, PARI program for A329127

Crossrefs

Cf. A197124.

Programs

PARI

See Links section.