Look-and-say sequence

Each term is obtained by reading the lengths and values of consecutive runs in the previous term. Starting from

1

gives

1, 11, 21, 1211, 111221, \dots

: for example,

21

contains one

2

followed by one

1

, so its successor is

1211

.

 Ancestors (7)

 Synonyms (1)

codex/look-and-say

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Look-and-say sequence by

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The Look-and-say sequence is a sequence of numbers where each term is generated from the previous term by describing its consecutive digits. The process involves "reading" the digits of the previous term and counting the number of digits in groups, then forming the next term based on that count. Here's how it works: 1. Start with an initial term, usually "1".

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