A037970 Numbers whose maximal base-2 run length is 3.

7, 8, 14, 17, 23, 24, 28, 29, 34, 35, 39, 40, 46, 49, 55, 56, 57, 58, 59, 68, 69, 70, 71, 72, 78, 81, 87, 88, 92, 93, 98, 99, 103, 104, 110, 113, 114, 115, 116, 117, 118, 119, 136, 137, 138, 139, 140, 141, 142, 145, 151, 152, 156, 157, 162, 163, 167, 168, 174

Offset

1,1

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Prog

(Python)
def ok(n):
    b = bin(n)[2:]
    return ("000" in b or "111" in b) and not ("0000" in b or "1111" in b)
print(list(filter(ok, range(175)))) # Michael S. Branicky, Jul 08 2021

Crossrefs

Cf. A007088.

Subsequence of A136037.

Sequence in context: A047274 A037368 A281710 * A101517 A271953 A165465

Adjacent sequences: A037967 A037968 A037969 * A037971 A037972 A037973

Keyword

nonn,base

Author

Clark Kimberling

Extensions

a(55) and beyond from Michael S. Branicky, Jul 08 2021

Status

approved