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Search: id:A080816
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| A080816 |
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Triangle read by rows in which n-th row gives trajectory of n (omitting n itself) under the map k -> k+1 if k odd, k -> k/2 if k even. |
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+0
2
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| 1, 4, 2, 1, 2, 1, 6, 3, 4, 2, 1, 3, 4, 2, 1, 8, 4, 2, 1, 4, 2, 1, 10, 5, 6, 3, 4, 2, 1, 5, 6, 3, 4, 2, 1, 12, 6, 3, 4, 2, 1, 6, 3, 4, 2, 1, 14, 7, 8, 4, 2, 1, 7, 8, 4, 2, 1, 16, 8, 4, 2, 1, 8, 4, 2, 1, 18, 9, 10, 5, 6, 3, 4, 2, 1, 9, 10, 5, 6, 3, 4, 2, 1, 20, 10, 5, 6, 3, 4, 2, 1, 10, 5, 6, 3, 4, 2, 1, 22
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Cino Hilliard, The x+1 conjecture
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EXAMPLE
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7 -> 8 -> 4 -> 2 -> 1, so the 7-th row is 8,4,2,1.
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PROGRAM
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(PARI) xnp1(n, p) = { print1(1" "); for(x=1, n, p1 = x; while(p1>1, if(p1%2==0, p1/=2, p1 = p1*p+1; ); print1(p1" ") ) ) }
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CROSSREFS
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Sequence in context: A075826 A085245 A046096 this_sequence A016507 A132116 A097525
Adjacent sequences: A080813 A080814 A080815 this_sequence A080817 A080818 A080819
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KEYWORD
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easy,nonn,tabf
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Mar 26 2003
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