The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A022511 Describe previous term from the right (method A - initial term is 7). 2
 7, 17, 1711, 211711, 21172112, 122112172112, 122112171112212211, 2122112231171112212211, 21221122311721132221221112, 12312211321321121721132221221112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Method A = 'frequency' followed by 'digit'-indication. LINKS Michael De Vlieger, Table of n, a(n) for n = 0..21 EXAMPLE The term after 1711 is obtained by saying "two 1's, one 7, one 1", which gives 211711. MATHEMATICA NestList[FromDigits@ Flatten@ Map[Reverse@ Flatten@ Tally[#] &, Split@ Reverse@ IntegerDigits[#]] &, 7, 9] (* Michael De Vlieger, Dec 16 2021 *) CROSSREFS Cf. A022506, A006711, A022482, A022507-A022513. Sequence in context: A093139 A177366 A138491 * A113613 A070415 A034083 Adjacent sequences: A022508 A022509 A022510 * A022512 A022513 A022514 KEYWORD nonn,base,easy,nice AUTHOR N. J. A. Sloane EXTENSIONS More terms from Erich Friedman STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 24 10:26 EST 2024. Contains 370294 sequences. (Running on oeis4.)