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 A244112 Reverse digit count of n in decimal representation. 10
 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1110, 21, 1211, 1311, 1411, 1511, 1611, 1711, 1811, 1911, 1210, 1211, 22, 1312, 1412, 1512, 1612, 1712, 1812, 1912, 1310, 1311, 1312, 23, 1413, 1513, 1613, 1713, 1813, 1913, 1410, 1411, 1412, 1413, 24, 1514, 1614, 1714 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Frequencies of digits 0 through 9, occurring in n, are summarized in order of decreasing digits; a(A010785(n)) = A047842(A010785(n)). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 EXAMPLE 101 contains two 1s and one 0, therefore a(101) = 2110; 102 contains one 2, one 1 and one 0, therefore a(102) = 121110. MATHEMATICA f[n_] := Block[{s = Split@ IntegerDigits@ n}, FromDigits@ Reverse@ Riffle[Union@ Flatten@ s, Length@# & /@ s]]; Array[f, 48, 0] (* Robert G. Wilson v, Dec 01 2016 *) PROG (Haskell) import Data.List (sort, group); import Data.Function (on) a244112 :: Integer -> Integer a244112 n = read \$ concat \$    zipWith ((++) `on` show) (map length xs) (map head xs)    where xs = group \$ reverse \$ sort \$ map (read . return) \$ show n (Python) def A244112(n):     return int(''.join([str(str(n).count(d))+d for d in '9876543210' if str(n).count(d) > 0])) # Chai Wah Wu, Dec 01 2016 (PARI) A244112(n, c=1, S="")={for(i=2, #n=vecsort(digits(n), , 4), n[i]==n[i-1]&&c++&&next; S=Str(S, c, n[i-1]); c=1); eval(Str(S, c, if(n, n[#n])))} \\ M. F. Hasler, Feb 25 2018 CROSSREFS Cf. A047842, A010785. See A036058 for the orbit of 0 under this map. Sequence in context: A047843 A097598 A045918 * A088476 A248014 A304366 Adjacent sequences:  A244109 A244110 A244111 * A244113 A244114 A244115 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Nov 11 2014 STATUS approved

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Last modified May 18 10:19 EDT 2021. Contains 343995 sequences. (Running on oeis4.)