Problem 594. "Look and say" sequence

What's the next number in this sequence?

  • [0]
  • [1 0]
  • [1 1 1 0]
  • [3 1 1 0]
  • [1 3 2 1 1 0]

This a variant on the well-known "look and say" or Morris sequence, where each new iteration is made up by 'saying' the number of numbers you see. That last line is "one 3; then two 1s; then one 0".

Create a function that returns the next element of this sequence, given a vector as a starting seed..

Solve

Solution Stats

44.6% Correct | 55.4% Incorrect
Last Solution submitted on Dec 23, 2025

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