A039378 Numbers whose base-9 representation has the same nonzero number of 3's and 4's.

31, 39, 112, 120, 193, 201, 247, 256, 265, 279, 280, 281, 284, 285, 286, 287, 292, 301, 310, 319, 327, 336, 345, 351, 352, 353, 356, 357, 358, 359, 372, 381, 390, 399, 436, 444, 517, 525, 598, 606, 679, 687, 760, 768, 841, 849, 922, 930, 976, 985, 994, 1008

Offset

1,1

Links

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

Mathematica

Select[Range[1000], DigitCount[#, 9, 3]==DigitCount[#, 9, 4]>0&] (* Harvey P. Dale, Apr 17 2022 *)

Prog

(MATLAB) x = 0:1008; d = dec2base(x, 9)-'0'; s1 = sum(d==3, 2); s2 = sum(d==4, 2); a = x(s1==s2 & s1>0); disp(regexprep(num2str(a), ' +', ', ')) % Chris R. Rehmann, Apr 10 2026

Crossrefs

Cf. A007095, A039097.

Cf. A039379, A039380, A039381, A039382.

Cf. A039360, A039367, A039373.

Sequence in context: A247251 A053237 A348518 * A043201 A043981 A146333

Adjacent sequences: A039375 A039376 A039377 * A039379 A039380 A039381

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved