A045041 Numbers whose base-4 representation contains no 0's and exactly four 2's.

170, 426, 618, 666, 678, 681, 683, 686, 698, 746, 938, 1450, 1642, 1690, 1702, 1705, 1707, 1710, 1722, 1770, 1962, 2410, 2458, 2470, 2473, 2475, 2478, 2490, 2538, 2650, 2662, 2665, 2667, 2670, 2682, 2710, 2713, 2715, 2718

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..4300

Mathematica

Select[Range[20000], DigitCount[#, 4, 0] == 0 && DigitCount[#, 4, 2] == 4 &] (* Vincenzo Librandi, Sep 23 2016 *)

Crossrefs

Cf. A007090.

Sequence in context: A067781 A043344 A045153 * A063943 A364905 A362561

Adjacent sequences: A045038 A045039 A045040 * A045042 A045043 A045044

Keyword

nonn,base

Author

Clark Kimberling

Status

approved