A045981 Describe all the previous terms!.

1, 11, 1121, 1121211211, 112121121121121112211221, 112121121121121112211221211211122112211221123122212211

Offset

1,2

Comments

Previous terms are described one by one in succession. Next terms are 118, 256, 564 and 1262 digits long.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..9

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

Wikipedia, Look-and-say sequence

Prog

(Haskell)
a045981 n = a045981_list !! (n-1)
a045981_list = 1 : f 1 [] where
   f x zs = y : f y zs' where
     y = read (concatMap show zs')
     zs' = zs ++ [a045918 x]
-- Reinhard Zumkeller, Feb 28 2014

Crossrefs

Cf. A005150, A045982.

Cf. A045918.

Sequence in context: A078568 A015095 A167118 * A090507 A177068 A358149

Adjacent sequences: A045978 A045979 A045980 * A045982 A045983 A045984

Keyword

nonn,easy,base,nice

Author

Anthony Joseph Splendora

Extensions

More terms from Patrick De Geest, Jun 15 1999

Status

approved