A022517 Describe previous term from the right (method B - initial term is 6).

6, 61, 1161, 116112, 21126112, 211261211221, 112212211161211221, 1122122111611322112212, 21112212223112611322112212, 21112212223112612112312311221321

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base
• easy
• nice

Comments

Method B = 'digit'-indication followed by 'frequency'.

Examples

			The term after 1161 is obtained by saying "1 once, 6 once, 1 twice", which gives 116112.
		

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 0..21

Crossrefs

Cf. A022481, A022488, A022514-A022520.

Programs

Haskell

import Data.List (group, transpose)
a022517 n = a022517_list !! n
a022517_list = 6 : f [6] :: [Integer] where
   f xs = (read $ concatMap show ys) : f ys where
          ys = concat $ transpose [map head zss, map length zss]
          zss = reverse $ group xs
-- Reinhard Zumkeller, Jan 26 2014

Extensions

More terms from Patrick De Geest, Jun 15 1999