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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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 https://oeis.org/ – rhsquared Sep 03 '18 at 11:46
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Also, this has already appeared several times on this site, see for example: https://puzzling.stackexchange.com/questions/2271/interview-question-or-pathbreaking-puzzle – hexomino Sep 03 '18 at 11:48
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Actually sombody showed me this riddle a long time ago i have no idea oeis.org exists. – kleusmeus Sep 03 '18 at 11:50
1 Answers
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1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211
sequence A005150 from OEIS https://oeis.org/A005150
rhsquared
- 9,220
- 3
- 31
- 52