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 A078670 Number of times n appears among the decimal digits of (n!)!. 0
 1, 1, 0, 4, 21, 169, 1504, 15755, 177333, 213789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS EXAMPLE a(4)=4 because 4 appears four times in (4!)! = 620448401733239439360000. MATHEMATICA Table[Count[Partition[IntegerDigits[(n!)!], IntegerLength[n], 1], IntegerDigits[ n]], {n, 10}] (* Harvey P. Dale, May 19 2014 *) Table[SequenceCount[IntegerDigits[(n!)!], IntegerDigits[n]], {n, 10}] (* The program uses the SequenceCount function from Mathematica version 10 *) (* Harvey P. Dale, Aug 08 2016 *) PROG (PARI) {mdcp(d, n)=local(a, c=0, L); L=length(Str(d)); if(L>1, a=2, a=1); while(n>0, if(n%(10^a)==d, n=floor(n/10); c++, n=floor(n/10); )); c } for(n=1, 10, print1(mdcp(n, n!!)", ")) CROSSREFS Cf. A000197. Sequence in context: A107872 A008858 A217484 * A317104 A163948 A278993 Adjacent sequences:  A078667 A078668 A078669 * A078671 A078672 A078673 KEYWORD base,more,nonn AUTHOR Jason Earls, Dec 16 2002 EXTENSIONS Added a(9) and a(10). - Ryan Leonel (ryan.leonel(AT)gmail.com), Oct 03 2008 STATUS approved

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Last modified September 30 22:26 EDT 2020. Contains 337440 sequences. (Running on oeis4.)