A045981 -id:A045981 - cp's OEIS frontend

A045982 Describe all the previous terms!.

1, 11, 31, 311311, 31131113211321, 3113111321132113211331131221131211, 31131113211321132113311312211312111321133113122113122113122123211311222113111221

Offset: 1

N. J. A. Sloane

Previous terms are concatenated into one large integer.

Next terms are 184, 420, 958 and 2194 digits long.

Reinhard Zumkeller, Table of n, a(n) for n = 1..10
Eric Weisstein's World of Mathematics, Look and Say Sequence.
Wikipedia, Look-and-say sequence.

Cf. A005150, A045981.

Cf. A045918.

a045982 n = a045982_list !! (n-1)
a045982_list = 1 : f [1] where
   f xs = y : f (xs ++ [y]) where
     y = a045918 $ read (concatMap show xs)
-- Reinhard Zumkeller, Feb 28 2014

More terms from Patrick De Geest, Jun 15 1999

A343837 Describe all the previous terms (previous terms are described one by one in succession; method - digit-indication followed by frequency, initial term is 1).

Original entry on oeis.org

1, 11, 1112, 11121321, 11121321132111312111, 1112132113211131211113211131211231211331112113

Offset: 1

Ilya Gutkovskiy, May 01 2021

The next term is too large to include.

			a(4) is obtained by saying "1 once; 1 twice; 1 thrice, 2 once", which gives 11121321.

Eric Weisstein's World of Mathematics, Look and Say Sequence

Cf. A005150, A007651, A045981, A045982, A060857, A343838.

A343838 Describe all the previous terms (previous terms are concatenated into one large integer; method - digit-indication followed by frequency, initial term is 1).

Original entry on oeis.org

1, 11, 13, 1431, 143111413111, 14311141311241311341113113, 14311141311241311341113114413113411131122141113112314113311231

Offset: 1

Ilya Gutkovskiy, May 01 2021

The next term is too large to include.

			a(4) is obtained by saying "1 four times, 3 once", which gives 1431.

Eric Weisstein's World of Mathematics, Look and Say Sequence

Cf. A005150, A007651, A045981, A045982, A060857, A343837.

cp's OEIS Frontend

A045982 Describe all the previous terms!.

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A343837 Describe all the previous terms (previous terms are described one by one in succession; method - digit-indication followed by frequency, initial term is 1).

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Examples

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A343838 Describe all the previous terms (previous terms are concatenated into one large integer; method - digit-indication followed by frequency, initial term is 1).

Views

Author

Keywords

Comments

Examples

Links

Crossrefs