A044435 Numbers k such that string 0,2 occurs in the base-3 representation of k but not of k+1.

11, 20, 29, 35, 38, 47, 56, 62, 65, 74, 83, 89, 92, 107, 110, 116, 119, 128, 137, 143, 146, 155, 164, 170, 173, 188, 191, 197, 200, 209, 218, 224, 227, 236, 245, 251, 254, 269, 272, 278, 281, 290, 323, 326, 332, 335, 350, 353, 359, 362, 371, 380, 386, 389, 398

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Prog

(Python)
from sympy.ntheory import digits
def cond(n): return "02" in "".join(map(str, digits(n, 3)))
def ok(n): return cond(n) and not cond(n+1)
print([k for k in range(400) if ok(k)]) # Michael S. Branicky, Nov 20 2021

Crossrefs

Cf. A007089, A044054.

Sequence in context: A339307 A038581 A044054 * A302563 A011753 A120442

Adjacent sequences: A044432 A044433 A044434 * A044436 A044437 A044438

Keyword

nonn,base

Author

Clark Kimberling

Status

approved