A023700 Numbers with exactly 2 2's in their ternary expansion.

8, 17, 20, 23, 24, 25, 35, 44, 47, 50, 51, 52, 56, 59, 60, 61, 65, 68, 69, 70, 72, 73, 75, 76, 89, 98, 101, 104, 105, 106, 116, 125, 128, 131, 132, 133, 137, 140, 141, 142, 146, 149, 150, 151, 153, 154, 156, 157, 164, 167, 168

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• easy

Links

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

Programs

Mathematica

Select[ Range[ 189 ], (Count[ IntegerDigits[ #, 3 ], 2 ]==2)& ]