A039284 Numbers whose base-5 representation has the same nonzero number of 0's and 2's.

10, 27, 35, 51, 53, 54, 55, 65, 70, 77, 85, 102, 110, 132, 136, 138, 139, 142, 147, 152, 160, 176, 178, 179, 180, 190, 195, 202, 210, 227, 235, 252, 256, 258, 259, 260, 266, 268, 269, 271, 273, 274, 276, 278, 279, 280, 290, 295, 300, 326, 328, 329, 330, 340

Offset

1,1

Links

Table of n, a(n) for n=1..54.

Mathematica

Select[Range[400], DigitCount[#, 5, 0]==DigitCount[#, 5, 2]>0&] (* Harvey P. Dale, Oct 03 2014 *)

Prog

(Python)
from sympy.ntheory import count_digits
def ok(n): c = count_digits(n, b=5); return c[0] == c[2] > 0
print([k for k in range(341) if ok(k)]) # Michael S. Branicky, Oct 27 2021

Crossrefs

Cf. A007091.

Supersequence of A045177.

Sequence in context: A281510 A024168 A043107 * A045177 A043887 A161450

Adjacent sequences: A039281 A039282 A039283 * A039285 A039286 A039287

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved