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 A108858 Numbers k that divide the sum of the digits of k!!, the double factorial of k. 0
 1, 2, 3, 4, 6, 9, 51, 57, 252, 585, 1131, 2106, 2172, 2250, 2292, 26159, 26769, 27253, 28071, 46802, 47148, 48018 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Next term after 48018, if it exists, is greater than 100000. LINKS Eric Weisstein's World of Mathematics, Double Factorial. EXAMPLE 585 is a term because the sum of the digits of 585!! = 2925 is divisible by 585. MATHEMATICA Do[If[Mod[Plus @@ IntegerDigits[n!! ], n] == 0, Print[n]], {n, 1, 100000}] CROSSREFS Cf. A006882. Sequence in context: A275173 A295394 A081419 * A294688 A094859 A267102 Adjacent sequences: A108855 A108856 A108857 * A108859 A108860 A108861 KEYWORD nonn,base,hard,more AUTHOR Ryan Propper, Jul 11 2005 STATUS approved

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Last modified December 5 02:30 EST 2022. Contains 358572 sequences. (Running on oeis4.)