In mathematics, the look-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, ... (sequence A005150 in OEIS). To generate a member of the sequence from the previous member, read off the digits of the previous member...
The Look and say sequence is a recursively defined sequence of numbers studied most notably by John Conway. Sequence Definition. Take a decimal number. Look at the number, visually grouping consecutive runs of the same digit.
The look-and-say sequence is the sequence of below integers: 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211
Look and Say sequence: describe the previous term! (method A - initial term is 1). (Formerly M4780). 128.
Finding Formulas for Number Sequences. Date: 11/22/97 at 02:10:07 From: Ricky Chu Subject: Formula.
Replace a[i] by last here (you may not want to add anything in the first round). After the loop you have to add the last value of the counter together with the last character again (this was not yet done), i.e. add another result = result+str(k)+last after the loop. In total it looks like.
Let’s go back and look at the sequence we were working with earlier and write the explicit formula for the sequence.
The look-and-say sequence is the sequence of numbers 1, 11, 21, 1211, 111221, 312211, …, in which each term is constructed by “reading” the previous term in the sequence. For example, the term 1 is read as “one 1”, which becomes the next term: 11.
That is: look-and-say is like Fibonacci, just with 92 instead of 2. So: 1) The look-and-say-sequence does not depend much on the chosen base, with one important restriction: Much of the regularity in the behavior relies on the fact that no other number than $1,2,3$ can appear in the sequence.
Look-and-Say sequences. A look-and-say sequence is a sequence of integers, expressed in decimal notation, where each sucessive term is generated by describing the previous one.