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Search: id:A022803
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| A022803 |
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Numbers that reach ...,7,8,4,2,1 under the mapping: if n is even divide by 2 else add 1. |
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+0
3
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| 13, 14, 25, 26, 27, 28, 49, 50, 51, 52, 53, 54, 55, 56, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) xnp1(n, p) = { for(x=1, n, p1 = x; while(p1>1, if(p1%2==0, p1/=2, p1 = p1*p+1; ); if(p1==7, print1(x" ")) ) ) }
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CROSSREFS
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Sequence in context: A076204 A098045 A079831 this_sequence A112653 A015905 A022103
Adjacent sequences: A022800 A022801 A022802 this_sequence A022804 A022805 A022806
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Mar 23 2003
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