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 A235992 Numbers with an even arithmetic derivative, cf. A003415. 10
 0, 1, 4, 8, 9, 12, 15, 16, 20, 21, 24, 25, 28, 32, 33, 35, 36, 39, 40, 44, 48, 49, 51, 52, 55, 56, 57, 60, 64, 65, 68, 69, 72, 76, 77, 80, 81, 84, 85, 87, 88, 91, 92, 93, 95, 96, 100, 104, 108, 111, 112, 115, 116, 119, 120, 121, 123, 124, 128, 129, 132, 133 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A165560(a(n)) = 0; A003415(a(n)) mod 2 = 0. For n > 1: A007814(a(n)) <> 1, A006519(a(n)) <> 2. Union of multiples of 4 and odd numbers with an even number of prime factors with multiplicity. - Charlie Neder, Feb 25 2019 After two initial terms (0 and 1), numbers n such that A086134(n) = 2. - Antti Karttunen, Sep 30 2019 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA Select[Range[0, 133], EvenQ@ If[Abs@ # < 2, 0, # Total[#2/#1 & @@@ FactorInteger[Abs@ #]]] &] (* Michael De Vlieger, Sep 30 2019 *) PROG (Haskell) a235992 n = a235992_list !! (n-1) a235992_list = filter (even . a003415) [0..] CROSSREFS Cf. A235991 (complement). Union of A327862 and A327864. Cf. A003415, A086134, A327863, A327865, A327933, A327935. Sequence in context: A145190 A327907 A177713 * A221865 A004753 A144794 Adjacent sequences:  A235989 A235990 A235991 * A235993 A235994 A235995 KEYWORD nonn,changed AUTHOR Reinhard Zumkeller, Mar 11 2014 STATUS approved

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Last modified October 14 14:06 EDT 2019. Contains 328017 sequences. (Running on oeis4.)