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 A107846 Number of duplicate digits of n. 3
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS a(A010784(n)) = 0; a(A109303(n)) > 0. - Reinhard Zumkeller, Jul 09 2013 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 FORMULA a(n) = A055642(n) - A043537(n). EXAMPLE a(11) = 1 because 11 has two total decimal digits but only one distinct digit (1) and 2-1=1. Similarly, a(3653135) = 7 (total digits) - 4 (distinct digits: 1,3,5,6) = 3 (There are three duplicate digits here, namely, 3, 3 and 5). MAPLE A107846:=proc(q) local a, b, c, n; for n from 0 to q do a:=n; b:=[];   while a>0 do c:=a mod 10; b:=[op(b), c]; a:=trunc(a/10); od;   a:=nops(b); b:=nops({op(b)}); print(a-b); od; end: A107846(10^4); # Paolo P. Lava, Apr 18 2013 MATHEMATICA Table[Total[Select[DigitCount[n]-1, #>0&]], {n, 0, 120}] (* Harvey P. Dale, Jul 31 2013 *) PROG (Haskell) import Data.List (sort, group) a107846 = length . concatMap tail . group . sort . show :: Integer -> Int -- Reinhard Zumkeller, Jul 09 2013 CROSSREFS Cf. A055642 (Total decimal digits of n), A043537 (Distinct decimal digits of n). Sequence in context: A011726 A297041 A070109 * A179801 A065202 A323547 Adjacent sequences:  A107843 A107844 A107845 * A107847 A107848 A107849 KEYWORD base,easy,nonn AUTHOR Rick L. Shepherd, May 24, 2005 STATUS approved

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Last modified May 5 19:23 EDT 2021. Contains 343573 sequences. (Running on oeis4.)