



3, 4, 6, 8, 15, 20, 21, 27, 28, 30, 33, 36, 39, 40, 42, 44, 48, 51, 52, 54, 56, 57, 64, 66, 68, 69, 72, 75, 76, 78, 87, 88, 92, 93, 96, 100, 102, 104, 105, 111, 114, 116, 123, 124, 128, 129, 135, 136, 138, 140, 141, 147, 148, 150, 152, 159, 164, 165, 172
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OFFSET

1,1


COMMENTS

These are the numbers 3x and 4x as x ranges through the numbers x > 1 in A325431.


REFERENCES

Equivalently, numbers k whose exponent of the highest power of 3 dividing k and exponent of the highest power of 4 dividing k have an opposite parity. The asymptotic density of this sequence is 7/20.  Amiram Eldar, Sep 20 2020


LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000


MATHEMATICA

a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1, Apply[Or,
Map[MemberQ[a, #] &, Select[Flatten[{#/3, #/4}],
IntegerQ]]] &]], {150}]; a (* A325431 *)
Complement[Range[Last[a]], a] (* A325432 *)
(* Peter J. C. Moses, Apr 25 2019 *)
Select[Range[100], !Equal @@ Mod[IntegerExponent[#, {3, 4}], 2] &] (* Amiram Eldar, Sep 20 2020 *)


CROSSREFS

Cf. A325417, A325431.
Sequence in context: A340770 A242870 A025073 * A204659 A134580 A007749
Adjacent sequences: A325429 A325430 A325431 * A325433 A325434 A325435


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, May 01 2019


STATUS

approved



