A107911 - OEIS

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A107911

Numbers having consecutive zeros and also consecutive ones in binary representation.

12, 19, 24, 25, 28, 35, 38, 39, 44, 48, 49, 50, 51, 52, 56, 57, 60, 67, 70, 71, 75, 76, 77, 78, 79, 83, 88, 89, 92, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 108, 112, 113, 114, 115, 116, 120, 121, 124, 131, 134, 135, 139, 140, 141, 142, 143, 147, 150, 151, 152

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Intersection of A004753 and A004780; complement of A107909.

LINKS

Table of n, a(n) for n=1..60.

Index entries for 2-automatic sequences.

MATHEMATICA

czcoQ[n_]:=Module[{c2=Partition[IntegerDigits[n, 2], 2, 1]}, MemberQ[c2, {0, 0}]&&MemberQ[c2, {1, 1}]]; Select[Range[200], czcoQ] (* Harvey P. Dale, Jul 24 2012 *)

PROG

(Python)

def ok(n): b = bin(n)[2:]; return "00" in b and "11" in b

print([k for k in range(153) if ok(k)]) # Michael S. Branicky, Dec 19 2021

CROSSREFS

Cf. A007088, A107907.

Sequence in context: A337424 A056688 A342071 * A143800 A344444 A231290

Adjacent sequences: A107908 A107909 A107910 * A107912 A107913 A107914

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 28 2005

EXTENSIONS

Offset changed to 1 by Michael S. Branicky, Dec 19 2021

STATUS

approved