A023711 Numbers with exactly 2 1's in their base 4 expansion.

5, 17, 20, 22, 23, 25, 29, 37, 53, 65, 68, 70, 71, 73, 77, 80, 82, 83, 88, 90, 91, 92, 94, 95, 97, 100, 102, 103, 105, 109, 113, 116, 118, 119, 121, 125, 133, 145, 148, 150, 151, 153, 157, 165, 181, 197, 209, 212, 214, 215, 217

Offset

1,1

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

Mathematica

Select[ Range[ 240 ], (Count[ IntegerDigits[ #, 4 ], 1 ]==2)& ]

Crossrefs

Sequence in context: A252232 A162862 A043338 * A045119 A045095 A061940

Adjacent sequences: A023708 A023709 A023710 * A023712 A023713 A023714

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved