A039276 Numbers whose base-3 representation has the same nonzero number of 0's and 2's.

6, 11, 15, 19, 21, 32, 34, 38, 42, 46, 48, 56, 58, 60, 64, 66, 72, 89, 95, 97, 101, 103, 105, 113, 115, 119, 123, 127, 129, 137, 139, 141, 145, 147, 153, 167, 169, 173, 175, 177, 181, 183, 191, 193, 195, 199, 201, 207, 217, 219, 225, 260, 266, 268, 278, 284

Offset

1,1

Links

Table of n, a(n) for n=1..56.

Mathematica

Select[Range[300], DigitCount[#, 3, 0]==DigitCount[#, 3, 2]>0&] (* Harvey P. Dale, May 10 2011 *)

Prog

(Python)
from sympy.ntheory import count_digits
def ok(n): d = count_digits(n, 3); return 0 in d and 2 in d and d[0] == d[2]
print(list(filter(ok, range(285)))) # Michael S. Branicky, Jun 11 2021

Crossrefs

Supersequence of A044995.

Cf. A007089, A005823.

Sequence in context: A315393 A315394 A043098 * A044995 A135708 A315395

Adjacent sequences: A039273 A039274 A039275 * A039277 A039278 A039279

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved