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A079676 LookAndSay(n) is palindromic. 1

%I #6 Jul 19 2023 20:29:56

%S 1,22,112,211,333,1113,1221,3111,4444,11114,13331,22122,22233,33222,

%T 41111,55555,111115,111223,112112,113332,144441,211211,222133,222244,

%U 233311,322111,331222,442222,511111,666666,1111116,1111224,1112113

%N LookAndSay(n) is palindromic.

%e LookAndSay(112) = 2112 ( two 1's, one 2), a palindrome, so 22 belongs to the sequence.

%t RunLengthEncode[x_List] := (Through[{First, Length}[ #1 ]] &) /@ Split[x]; Do[a = Flatten[ RunLengthEncode[ IntegerDigits[n]]]; If[a == Reverse[a], Print[n]], {n, 1, 10^6}]

%Y Different from A079466.

%K base,nonn

%O 1,2

%A _Joseph L. Pe_, Jan 26 2003

%E More terms from _Robert G. Wilson v_, Jan 27 2003

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Last modified August 20 19:38 EDT 2024. Contains 375339 sequences. (Running on oeis4.)