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A342699
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Numbers k such that A342698(k) = k.
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2
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0, 1, 3, 7, 9, 12, 15, 17, 19, 24, 25, 28, 31, 33, 35, 39, 48, 49, 51, 56, 57, 60, 63, 65, 67, 71, 79, 96, 97, 99, 103, 112, 113, 115, 120, 121, 124, 127, 129, 131, 135, 143, 153, 159, 192, 193, 195, 199, 204, 207, 224, 225, 227, 231, 240, 241, 243, 248, 249
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OFFSET
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1,3
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COMMENTS
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Equivalently, these are the numbers k such that each bit in the binary representation of k is next to a bit with the same value (and we consider that the first bit is next to the last bit). Hence, all terms of A033015 belong to this sequence.
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LINKS
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Rémy Sigrist, Table of n, a(n) for n = 1..10000
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PROG
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(PARI) is(n) = my (w=#binary(n)); sum(k=0, w-1, ((bittest(n, (k-1)%w)+bittest(n, k%w)+bittest(n, (k+1)%w))>=2) * 2^k)==n
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CROSSREFS
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Cf. A033015, A342698.
Sequence in context: A175637 A110404 A190366 * A284819 A190742 A289906
Adjacent sequences: A342696 A342697 A342698 * A342700 A342701 A342702
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KEYWORD
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nonn,base
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AUTHOR
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Rémy Sigrist, Mar 18 2021
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STATUS
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approved
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