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This question already has an answer here:

This puzzle should be easy to solve if you don't overthink.

1, 11, 21, 1211, 111221, ???

What's the next number?

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marked as duplicate by Gareth McCaughan Sep 3 '18 at 11:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Hello and welcome to PSE. As you are definitely not the author of this sequence you should really post where you got it from. Most of the popular number sequences are listed in OEIS at oeis.org $\endgroup$ – rhsquared Sep 3 '18 at 11:46
  • $\begingroup$ Also, this has already appeared several times on this site, see for example: puzzling.stackexchange.com/questions/2271/… $\endgroup$ – hexomino Sep 3 '18 at 11:48
  • $\begingroup$ Actually sombody showed me this riddle a long time ago i have no idea oeis.org exists. $\endgroup$ – kleusmeus Sep 3 '18 at 11:50
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1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211 sequence A005150 from OEIS https://oeis.org/A005150

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