A031966 Numbers with exactly four distinct base-7 digits.

360, 361, 362, 363, 366, 368, 369, 370, 373, 374, 376, 377, 380, 381, 382, 384, 387, 388, 389, 390, 444, 445, 446, 447, 462, 466, 467, 468, 469, 472, 474, 475, 476, 479, 480, 482, 483, 486, 487, 488, 492, 494, 495, 496, 504

Offset

1,1

Links

Table of n, a(n) for n=1..45.

Mathematica

db74Q[n_]:=Count[DigitCount[n, 7], _?(#>0&)]==4; Select[Range[600], db74Q] (* Harvey P. Dale, Oct 21 2017 *)

Crossrefs

Cf. A007093.

Sequence in context: A097570 A185641 A352225 * A137487 A069478 A060665

Adjacent sequences: A031963 A031964 A031965 * A031967 A031968 A031969

Keyword

nonn,base

Author

Clark Kimberling

Status

approved