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Search: id:A133419
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| A133419 |
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Image of n under one application of the "5x+1" map. |
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+0
8
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| 6, 1, 1, 2, 26, 3, 36, 4, 3, 5, 56, 6, 66, 7, 5, 8, 86, 9, 96, 10, 7, 11, 116, 12, 126, 13, 9, 14, 146, 15, 156, 16, 11, 17, 176, 18, 186, 19, 13, 20, 206, 21, 216, 22, 15, 23, 236, 24, 246, 25, 17, 26, 266, 27, 276, 28, 19, 29, 296, 30, 306, 31, 21, 32, 326, 33, 336, 34, 23, 35
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The 5x+1 map sends x to x/2 if x is even, x/3 if x is divisible by 3, otherwise 5x+1.
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LINKS
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Tomas Oliveira e Silva, The px+1 problem
Index entries for sequences related to 3x+1 (or Collatz) problem
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MATHEMATICA
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Table[If[EvenQ[n], n/2, If[Mod[n, 3] == 0, n/3, 5*n + 1]], {n, 1, 80}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 16 2008
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CROSSREFS
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Cf. A133420, ...
Sequence in context: A050449 A108131 A073354 this_sequence A010134 A019713 A138073
Adjacent sequences: A133416 A133417 A133418 this_sequence A133420 A133421 A133422
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KEYWORD
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nonn,easy
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AUTHOR
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njas, Nov 27 2007
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 16 2008
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