A039376 Numbers whose base-9 representation has the same nonzero number of 2's and 7's.

25, 65, 106, 146, 169, 178, 196, 205, 214, 223, 225, 226, 228, 229, 230, 231, 233, 241, 268, 308, 349, 389, 430, 470, 511, 551, 569, 578, 585, 586, 588, 589, 590, 591, 593, 596, 605, 614, 623, 641, 673, 713, 754, 794, 835, 875, 898, 907, 925, 934, 943, 952

Offset

1,1

Links

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

Mathematica

Select[Range[1000], DigitCount[#, 9, 2]==DigitCount[#, 9, 7]>0&] (* Harvey P. Dale, Apr 04 2020 *)

Prog

(MATLAB) x = 0:952; d = dec2base(x, 9)-'0'; s1 = sum(d==2, 2); s2 = sum(d==7, 2); a = x(s1==s2 & s1>0); disp(regexprep(num2str(a), ' +', ', ')) % Chris R. Rehmann, Apr 10 2026

Crossrefs

Cf. A007095, A039095.

Cf. A039372, A039373, A039374, A039375, A039377.

Cf. A039363, A039370, A039381, A039385, A039388, A039390.

Sequence in context: A285579 A050993 A121387 * A043199 A043979 A033682

Adjacent sequences: A039373 A039374 A039375 * A039377 A039378 A039379

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved