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 A136701 Final nonzero digit of n! in base 15. 15
 1, 1, 2, 6, 9, 8, 3, 6, 3, 12, 3, 3, 6, 3, 12, 12, 12, 9, 12, 3, 9, 9, 3, 9, 6, 9, 9, 3, 9, 6, 12, 12, 9, 12, 3, 12, 12, 9, 12, 3, 3, 3, 6, 3, 12, 6, 6, 12, 6, 9, 12, 12, 9, 12, 3, 6, 6, 12, 6, 9, 6, 6, 12, 6, 9, 9, 9, 3, 9, 6, 3, 3, 6, 3, 12, 9, 9, 3, 9, 6, 12, 12, 9, 12, 3, 12, 12, 9, 12, 3, 3, 3, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS From Robert Israel, Jun 08 2018: (Start) For n >= 6, a(n) is 3, 6, 9 or 12. For k >= 2, a(5*k) = a(5*k+1) = a(5*k+3). (End) LINKS Robert Israel, Table of n, a(n) for n = 0..10000 EXAMPLE 6! = 720 decimal = 330 quindecimal, so a(6) = 3. MAPLE a:= 1: b:= 0: R[0]:= 1: for n from 1 to 100 do alpha:= padic:-ordp(n, 3); beta:= padic:-ordp(n, 5); a:= a * n/3^alpha/5^beta; b:= b + alpha - beta; R[n]:= a * 3 &^ b mod 15; od: seq(R[n], n=0..100); # Robert Israel, Jun 08 2018 MATHEMATICA nzd[x_]:=If[x[[-1, 1]]==0, x[[-2, 1]], x[[-1, 1]]]; Table[nzd[Split[IntegerDigits[n!, 15]]], {n, 0, 100}] (* Harvey P. Dale, Jul 11 2023 *) CROSSREFS Cf. A000142, A136690, A136691, A136692, A136693, A136694, A136695, A136696, A008904, A136697, A136698, A136699, A136700, A136702. Sequence in context: A242433 A011046 A246828 * A175030 A335027 A263178 Adjacent sequences: A136698 A136699 A136700 * A136702 A136703 A136704 KEYWORD base,easy,nonn AUTHOR Carl R. White, Jan 16 2008 STATUS approved

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Last modified June 21 01:13 EDT 2024. Contains 373535 sequences. (Running on oeis4.)