A336034 - OEIS

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A336034

The rightmost digit d of a(n) jumps over d digits to the right and is duplicated there. Lexicographically earliest sequence of distinct positive integers with this property.

1, 2, 11, 21, 3, 12, 4, 322, 5, 42, 6, 7, 251, 8, 161, 71, 9, 13, 82, 1322, 19, 22, 14, 24, 15, 49, 43, 151, 31, 41, 91, 51, 61, 81, 111, 112, 16, 23, 17, 33, 62, 53, 27, 63, 18, 73, 37, 83, 25, 831, 715, 26, 28, 35, 29, 64, 158, 34, 36, 93, 44

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OFFSET

1,2

COMMENTS

No term ends in 0 as this would force the next integer to start with zero.

LINKS

Carole Dubois, Table of n, a(n) for n = 1..5000

EXAMPLE

The rightmost digit of a(1) = 1 is 1; we duplicate this digit in position 3;

The rightmost digit of a(2) = 2 is 2; we duplicate this digit in position 5;

The rightmost digit of a(3) = 11 is 1; we duplicate this digit in position 6;

The rightmost digit of a(4) = 21 is 1; we duplicate this digit in position 8;

The rightmost digit of a(5) = 3 is 3; we duplicate this digit in position 11; etc.

CROSSREFS

Cf. A336035 (duplication of the leftmost digit of a(n) to the left), A336036 (first and last digits of a(n) are duplicated respectively to the left and to the right).

Sequence in context: A061907 A052216 A094629 * A081242 A071762 A288945

Adjacent sequences: A336031 A336032 A336033 * A336035 A336036 A336037

KEYWORD

base,nonn

AUTHOR

Eric Angelini and Carole Dubois, Jul 05 2020

STATUS

approved