A039388 Numbers whose base-9 representation has the same nonzero number of 5's and 7's.

52, 68, 133, 149, 214, 230, 295, 311, 376, 392, 412, 421, 430, 439, 448, 466, 468, 469, 470, 471, 472, 474, 476, 484, 538, 554, 572, 581, 590, 599, 608, 612, 613, 614, 615, 616, 618, 620, 626, 644, 700, 716, 781, 797, 862, 878, 943, 959, 1024, 1040

Offset

1,1

Links

Chris R. Rehmann, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[1100], DigitCount[#, 9, 5]==DigitCount[#, 9, 7]>0&] (* Harvey P. Dale, Oct 09 2011 *)

Prog

(MATLAB) x = 0:1040; d = dec2base(x, 9)-'0'; s1 = sum(d==5, 2); s2 = sum(d==7, 2); a = x(s1==s2 & s1>0); disp(regexprep(num2str(a), ' +', ', ')) % Chris R. Rehmann, Apr 14 2026

Crossrefs

Cf. A007095, A039107.

Cf. A039387, A039389.

Cf. A039363, A039370, A039376, A039381, A039385, A039390.

Sequence in context: A045178 A124471 A107933 * A043211 A043991 A326235

Adjacent sequences: A039385 A039386 A039387 * A039389 A039390 A039391

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved