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A037238
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x -> 5x - 1 if x odd, else x -> x/2.
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1
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19, 94, 47, 234, 117, 584, 292, 146, 73, 364, 182, 91, 454, 227, 1134, 567, 2834, 1417, 7084, 3542, 1771, 8854, 4427, 22134, 11067, 55334, 27667, 138334, 69167, 345834, 172917, 864584, 432292, 216146, 108073, 540364, 270182, 135091, 675454, 337727
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Reaches 4, 2, 1, 4, 2, 1, ... in 437 steps. - T. D. Noe, Mar 01 2008
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LINKS
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MATHEMATICA
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NestList[If[EvenQ[#], #/2, 5# - 1] &, 19, 100] (* Alonso del Arte, Nov 19 2020 *)
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PROG
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(Scala) def fiveX(n: Int): Int = n % 2 match {
case 0 => n / 2
case _ => 5 * n - 1
}
val A037238 = LazyList.iterate(19)(fiveX)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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Dan Goldwater (dan(AT)craftech.com)
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EXTENSIONS
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STATUS
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approved
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