login
A043420
Numbers whose base-7 representation contains exactly four 6's.
1
2400, 4801, 7202, 9603, 12004, 14405, 14748, 15091, 15434, 15777, 16120, 16463, 16512, 16561, 16610, 16659, 16708, 16757, 16764, 16771, 16778, 16785, 16792, 16799, 16800, 16801, 16802, 16803, 16804, 16805, 19207
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[20000], DigitCount[#, 7, 6]==4&] (* Harvey P. Dale, Mar 27 2017 *)
CROSSREFS
Cf. A007093.
Sequence in context: A108055 A286342 A204357 * A233880 A234453 A236084
KEYWORD
nonn,base
STATUS
approved