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Search: id:A153775
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| A153775 |
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Sequence S such that 1 is in S and if x is in S, then 3x-1 and 3x are in S. |
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4
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| 1, 2, 3, 5, 6, 8, 9, 14, 15, 17, 18, 23, 24, 26, 27, 41, 42, 44, 45, 50, 51, 53, 54, 68, 69, 71, 72, 77, 78, 80, 81, 122, 123, 125, 126, 131, 132, 134, 135, 149, 150, 152, 153, 158, 159, 161, 162, 203, 204, 206, 207, 212, 213, 215, 216, 230, 231, 233, 234, 239, 240, 242
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Subsequences include A007051, A000244, A153773, A153774.
1st generation: 1
2nd generation: 2, 3
3rd generation: 5, 6, 8, 9
4th generation: 14, 15, 17, 18, 23, 24, 26, 27
Does every generation contain a prime?
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CROSSREFS
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Cf. A007051, A000244, A147992, A153773, A153774.
Sequence in context: A030709 A058588 A035399 this_sequence A063756 A117522 A028374
Adjacent sequences: A153772 A153773 A153774 this_sequence A153776 A153777 A153778
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.duc), Jan 02 2009
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