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Search: id:A133421
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| A133421 |
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Image of n under one application of the "7x+1" map. |
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+0
4
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| 8, 1, 1, 2, 1, 3, 50, 4, 3, 5, 78, 6, 92, 7
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The 7x+1 map sends x to x/2 if x is even, x/3 if x is divisible by 3, x/5 if x is divisible by 5, otherwise 7x+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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CROSSREFS
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Cf. A133422, A133419, ...
Sequence in context: A011264 A066341 A010153 this_sequence A128881 A010151 A021556
Adjacent sequences: A133418 A133419 A133420 this_sequence A133422 A133423 A133424
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KEYWORD
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nonn,easy,more
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AUTHOR
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njas, Nov 27 2007
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