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A007890 Summarize the previous term! (in decreasing order). 6
1, 11, 21, 1211, 1231, 131221, 132231, 232221, 134211, 14131231, 14231241, 24132231, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Onno M. Cain, Sela T. Enin, Inventory Loops (i.e. Counting Sequences) have Pre-period 2 max S_1 + 60, arXiv:2004.00209 [math.NT], 2020.
FORMULA
From Seiichi Manyama, Aug 18 2020: (Start)
a(1) = 1 and a(n) = A244112(a(n-1)) for n > 1.
a(n) = 14233221 for n >= 13. (End)
EXAMPLE
For example, the term after 131221 is obtained by saying "one 3, two 2's, three 1's", which gives 13-22-31, i.e. 132231.
MATHEMATICA
Nest[Append[#, FromDigits@ Flatten@ Map[Reverse, Tally@ ReverseSort@ IntegerDigits@ #[[-1]] ] ] &, {1}, 24] (* Michael De Vlieger, Jul 15 2020 *)
CROSSREFS
Sequence in context: A005151 A098155 A098154 * A063850 A005150 A001388
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved

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Last modified April 20 00:03 EDT 2024. Contains 371798 sequences. (Running on oeis4.)