| 1, 7, 11, 19, 31, 43, 163, 283, 403, 1111, 1123, 1243, 1303, 1549, 1963, 4123, 9643, 10003, 11539, 21431, 76963, 97031, 468109, 1351963, 4553323, 4778471, 5163139, 6563551, 7618843, 45214123, 65704243, 161738803, 202903723
(list; graph; listen)
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OFFSET
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1,2
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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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N. J. A. Sloane, Table of n, a(n) for n=1..53 (from the web page of Tomas Oliveira e Silva)
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. A133421, A133426, A133419, ...
Sequence in context: A141337 A053403 A032672 this_sequence A038984 A055939 A023267
Adjacent sequences: A133422 A133423 A133424 this_sequence A133426 A133427 A133428
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KEYWORD
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nonn
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AUTHOR
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njas, Nov 27 2007
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