A045982 Describe all the previous terms!.

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

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy
• base
• nice

Comments

Previous terms are concatenated into one large integer.

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

Links

• 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.

Crossrefs

Cf. A005150, A045981.

Cf. A045918.

Programs

Haskell

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

Extensions

More terms from Patrick De Geest, Jun 15 1999