 # Look-and-say number generator

## World's simplest math tool

Free online look-and-say number generator. Just specify how many look-and-say numbers you need and you'll automatically get that many numbers. There are no ads, popups or nonsense, just an awesome look-and-say calculator. Press a button, get look-and-say sequence. Created by math nerds from team Browserling.
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Look-and-say Alphabet
Initial sequence alphabet.
You can use numbers and letters in the initial alphabet. The initial alphabet will be used to generate the next sequence members.
Start and Count
Start generating sequence from this sequence position.
How many elements to generate?
Look-and-say Separator
Separate sequence members with this symbol. (Line break "\n" by default.)
Look-and-say number generator tool What is a look-and-say number generator?
This tool calculates look-and-say sequence numbers. Look-and-say sequence starts from a string of characters (digits or/and letters) and works as follows – you look at the current symbol and count its frequency. For example, if you look at "22a", you count "two twos" and "one a" so the next sequence element is "221a", and then you repeat this process. You can specify the starting set how many numbers you need and which sequence element to start with. Mathabulous!
Look-and-say number generator examples Click to use
Generate 8 Look-and-say Numbers
This example calculates eight look-and-say numbers starting from the first element.
1 11 21 1211 111221 312211 13112221 1113213211
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Calculate Five Look-and-say Numbers
This example generates 5 look-and-say numbers starting from the 10th element.
13211311123113112211 11131221133112132113212221 3113112221232112111312211312113211 1321132132111213122112311311222113111221131221 11131221131211131231121113112221121321132132211331222113112211
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Change Sequence Numbers Separator
This example generates 5 look-and-say numbers and changes separator between numbers.
1 | 11 | 21 | 1211 | 111221
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Start the Sequence From a Letter
This example starts the look-and-say sequence from a single character "d". In all the following sequence elements, numbers that describe the sequence frequency always appear before the letter "d". The letter itself always remains on the right side. If you think for a little bit, you'll realize that in any sequence the last element will always remain on the right side and never change.
d; 1d; 111d; 311d; 13211d; 111312211d; 31131122211d; 1321132132211d
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Parentheses in Look-and-say Sequence
In this example, the sequence is formed from two round brackets. In this case, the numbers appear only in front of the opening bracket, and inside the bracket pair. Surprisingly, these numbers are the same! This sequence works for any pair of different characters.
() 1(1) 111(111) 311(311) 13211(13211) 111312211(111312211)
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Growth in Look-and-say Sequence
This example demonstrates that any look-and-say sequence increases over time (except for the degenerate case: 22, 22, 22, ...). In this example the starting alphabet consists of eleven ones. Although a couple of first members decrease in length, the sequence increases with time and grows in length.
11111111111 111 31 1311 111321 31131211 132113111221 1113122113312211
Required options
These options will be used automatically if you select this example.
Initial sequence alphabet.
Start generating sequence from this sequence position.
How many elements to generate?
Separate sequence members with this symbol. (Line break "\n" by default.)
Pro tips Master online math 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://onlinemathtools.com/generate-look-and-say-sequence?&first-element=1&count=8&separator=%5Cn&alphabet=1
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Create a list of composite numbers.
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Create a list of secant numbers.
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Create a list of motzkin numbers.
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Create a list of semiperfect numbers.
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Create a list of Ulam numbers.
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Create a list of weird numbers.
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Create a list of superperfect numbers.
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Find all partitions of the given integer.
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Create an arithmetic sequence of numbers.
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Create a geometric sequence of numbers.
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Create a list of natural numbers.
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Create a list of numbers of powers of two.
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