A225332 A continuous "look-and-repeat" sequence (seed 2).

2, 1, 1, 2, 2, 2, 1, 3, 3, 2, 1, 1, 1, 2, 2, 3, 1, 1, 2, 3, 3, 1, 2, 2, 2, 1, 1, 3, 2, 2, 1, 1, 1, 2, 2, 2, 3, 1, 1, 1, 3, 3, 2, 2, 2, 1, 1, 1, 3, 2, 2, 2, 3, 3, 1, 3, 3, 2, 1, 1, 3, 3, 3, 1, 2, 2, 3, 3, 3, 2, 3, 3

Offset

1,1

Comments

The 'look-and-repeat' sequence A225330, with seed 2. The variant A225331 with the same seed 2 gives this same sequence.

It describes at each step the preceding digits by repeating the frequency number.

The sequence is determined by triples of digits. The first two terms of a triple are the repeated count and the last term is the digit.

a(n) is always equal to 1, 2, 3, or 5. No series of four identical digits happens in the sequence, nor any of five 5's.

Applying the look-and-repeat principle to the sequence itself, it is simply shift one rank to the left.

Links

Table of n, a(n) for n=1..72.

Example

a(1) = 2, you then see "one 2" and repeating "one", a(2) = a(3) = 1 (one) and a(4) = 2; you have then two 1's, so 2, 2, 1; then three 2, so 3, 3, 1, etc.

Crossrefs

Cf. A225330, A225331 (two variants with seed 1), A225329 (look-and-repeat by block), A005150 (original look-and-say), A225224, A221646, A225212 (continuous look-and-say versions).

Sequence in context: A286569 A342749 A131335 * A209032 A183935 A046081

Adjacent sequences: A225329 A225330 A225331 * A225333 A225334 A225335

Keyword

nonn,easy

Author

Jean-Christophe Hervé, May 12 2013

Status

approved