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Look and say sequence generator

World's simplest number tool

Quickly calculate a list of look and say numbers in your browser. To get your sequence, just enter the starting alphabet, starting term position, and the length of the sequence in the options below, and this utility will calculate that sequence. Created by developers for developers.
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Starting Alphabet and Position
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Sequence Length
Generate this many look and say numbers.
Term Separator
Split look and say sequence terms by this symbol. (By default newline.)
Look and say sequence generator tool What is a look and say sequence generator?
This is an online browser-based utility for generating a list of look and say numbers. The look and say sequence, invented by mathematician John Conway and popularized by Robert Morris, is also known as "count and say sequence" or "say what you see sequence". It's generated by describing a series of digits as letters in plain English language. The n-th term is constructed by reading the (n-1)-th term. For example, if the first term is "1", then to get the next term, we read what we see – "one one" and we get the next term – "11". Now, when we read this term, we say "two ones" and we get the third term – "21", and so it goes on. In this tool, you can specify the initial alphabet for the first term. It can be a series of digits and letters that will be read and described further in the sequence. You can also set the starting term position, specify how many following values you need, and adjust the separating character between terms. That's numberwang!
Look and say sequence generator examples Click to use
First Ten Look and Say Numbers
In this example, we generate the first 10 numbers of the count and say sequence, outputting each term on a new line.
1 11 21 1211 111221 312211 13112221 1113213211 31131211131221 13211311123113112211
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
20th Term of Morris Number Sequence
The look and say sequence is often called Morris sequence as it was popularized by cryptographer Robert Morris. In this example, we calculate the 20th term of the Morris number sequence, by specifying the starting number 20, and the amount 1.
11131221131211132221232112111312111213111213211231132132211211131221131211221321123113213221123113112221131112311332211211131221131211132211121312211231131112311211232221121321132132211331121321231231121113112221121321133112132112312321123113112221121113122113121113123112112322111213211322211312113211
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
Arrow-separated Terms
In this example, we put an arrow character between the say what you see sequence numbers in order to better illustrate the flow of sequence members.
1 → 11 → 21 → 1211 → 111221 → 312211 → 13112221
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
Alphanumeric Sequence
In this example, we generate an alphanumeric look and say sequence. The first term consists of the first three letters of the English alphabet "abc". When we read it aloud we say "one a, one b, one c". As a result, we get "1a1b1c" as the second term. In the following values, the digits change but the three initial letters remain unchanged.
abc 1a1b1c 111a111b111c 311a311b311c 13211a13211b13211c
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
Fixed Point
In this example, we illustrate the fixed point of look and say sequence. The members of the sequence in this example are constant and never change. It's because they are written the same way they are read. This sequence is only possible if the initial alphabet is "22". Reading it aloud "two twos", we get the same following term. We generate 15 such constants and separate them by a space. This sequence is also sometimes called degenerate sequence as it never changes.
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
Conway's Sequence
This example generates Conway's sequence. This sequence, invented by mathematician Ilan Vardi, is a variation of look and say sequence and the only change is that the starting number is "3". We calculate eight Conway sequence's members and display each of them on a new line.
3 13 1113 3113 132113 1113122113 311311222113 13211321322113
Required options
These options will be used automatically if you select this example.
Specify a series of digits and/or letters for the first term.
Starting look and say sequence term.
Generate this many look and say numbers.
Split look and say sequence terms by this symbol. (By default newline.)
Pro tips Master online number tools
You can pass options to this tool using their codes as query arguments and it will automatically compute output. To get the code of an option, just hover over its icon. Here's how to type it in your browser's address bar. Click to try!
https://onlinenumbertools.com/generate-look-and-say-numbers?&first-element=1&count=10&separator=%5Cn&alphabet=1
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