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Search: id:A141709
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| A141709 |
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Least positive multiple of n which is palindromic in base 2, allowing for leading zeros (or: igoring trailing zeros). |
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+0
1
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 33, 12, 65, 14, 15, 16, 17, 18, 513, 20, 21, 66, 2047, 24, 325, 130, 27, 28, 1421, 30, 31, 32, 33, 34, 455, 36, 2553, 1026, 195, 40, 1025, 42, 129, 132, 45, 4094, 4841, 48, 1421, 650, 51, 260, 3339, 54, 165, 56, 513, 2842, 6077, 60, 427, 62
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Even numbers cannot be palindromic in base 2, unless leading zeros are considered (or, equivalently, resp. more precisely, trailing zeros are discarded). This is done in this version of A141708, which therefore does not need to be restricted to odd n as it has been done for A141707 and A141708.
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PROGRAM
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(PARI) A141709(n)=forstep(k=n, 10^9, n, vecextract(t=binary(k>>valuation(k, 2)), "-1..1")-t|return(k))
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CROSSREFS
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Cf. A050782, A141707-A141708, A062279.
Sequence in context: A161978 A132579 A004850 this_sequence A062683 A137857 A161980
Adjacent sequences: A141706 A141707 A141708 this_sequence A141710 A141711 A141712
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KEYWORD
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base,easy,nice,nonn
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AUTHOR
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M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Jul 17 2008
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