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A022500 Describe the previous term! (method B - initial term is 4). 10
4, 41, 4111, 4113, 411231, 4112213111, 411222113113, 41122312311231, 4112223111213112213111, 41122331132111311222113113, 411222321231211331122312311231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..23

EXAMPLE

E.g. the term after 4113 is obtained by saying "4 once, 1 twice, 3 once", which gives 411231.

MATHEMATICA

a[1] = 4;

a[n_] := a[n] = {#[[1]], Length[#]}& /@ Split[a[n-1] // IntegerDigits] // Flatten // FromDigits;

Array[a, 11] (* Jean-Fran├žois Alcover, Jul 13 2016 *)

CROSSREFS

Cf. A007651, A022470, A022499, A022501-A022505.

Sequence in context: A006825 A333731 A326899 * A320335 A076652 A078288

Adjacent sequences:  A022497 A022498 A022499 * A022501 A022502 A022503

KEYWORD

nonn,base,easy,nice

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)