A391581 Numbers k whose binary expansion contains 2 adjacent 1's and A391571(k) = k.

1117, 1351, 1813, 2234, 2695, 2702, 3605, 3626, 4468, 5383, 5390, 5404, 5447, 7189, 7210, 7252, 7253, 8733, 8936, 9309, 9607, 10759, 10766, 10780, 10808, 10894, 14357, 14378, 14411, 14420, 14504, 14506, 14865, 14867, 17466, 17501, 17735, 17872, 18197, 18618, 19214, 21127, 21511, 21518, 21532, 21560, 21575, 21616

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to binary expansion of n.

Index entries for sequences related to carryless arithmetic.

Prog

(PARI) is_A391581(k) = (0!=bitand(k, k<<1) && (A391571(k)==k));

Crossrefs

Setwise difference A004780 \ A391580.

Together with A003714 gives the fixed points of A391571.

Sequence in context: A258691 A221428 A161848 * A020380 A243527 A251360

Adjacent sequences: A391578 A391579 A391580 * A391582 A391583 A391584

Keyword

nonn,base

Author

Antti Karttunen, Dec 17 2025

Status

approved