A039320 Numbers whose base-7 representation has the same nonzero number of 2's and 4's.

18, 30, 67, 79, 102, 109, 123, 126, 127, 129, 131, 132, 137, 144, 165, 177, 198, 205, 210, 211, 213, 215, 216, 219, 233, 240, 263, 275, 312, 324, 361, 373, 410, 422, 445, 452, 466, 469, 470, 472, 474, 475, 480, 487, 508, 520, 541, 548, 553, 554, 556, 558

Offset

1,1

Links

Table of n, a(n) for n=1..52.

Mathematica

Select[Range[600], DigitCount[#, 7, 2]==DigitCount[#, 7, 4]>0&] (* Harvey P. Dale, Nov 20 2016 *)

Crossrefs

Cf. A007093.

Sequence in context: A161164 A092357 A141115 * A043143 A043923 A160916

Adjacent sequences: A039317 A039318 A039319 * A039321 A039322 A039323

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved