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Search: id:A054646
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| A054646 |
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Smallest number to give 2^2n in a hailstone (3x + 1) sequence. |
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+0
1
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| 1, 3, 21, 75, 151, 1365, 5461, 14563, 87381, 184111, 932067, 5592405, 13256071, 26512143, 357913941, 1431655765, 3817748707, 22906492245, 91625968981, 244335917283, 1466015503701, 5212499568715, 10424999137431
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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In hailstone sequences, only even powers of 2 are obtained as a final peak before descending to 1.
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REFERENCES
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J. Heleen, Final Peak Sequences for Hailstone Numbers, 1993, preprint.
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CROSSREFS
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Sequence in context: A117984 A050615 A083564 this_sequence A109721 A067002 A110450
Adjacent sequences: A054643 A054644 A054645 this_sequence A054647 A054648 A054649
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KEYWORD
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easy,nice,nonn
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AUTHOR
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Jeffrey Heleen (meriaden(AT)hotmail.com), Apr 16 2000
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