A044972 Numbers whose base-3 representation contains exactly one 0 and two 1's.

10, 12, 32, 34, 38, 42, 46, 48, 58, 64, 66, 98, 104, 106, 116, 128, 132, 140, 142, 146, 150, 154, 156, 176, 178, 184, 194, 196, 200, 204, 208, 210, 220, 226, 228, 296, 314, 320, 322, 350, 386, 398, 402, 422, 428, 430, 440, 452

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• easy
• base

Links

• David A. Corneth, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A007089, A024023.

Programs

Mathematica

Select[Range[500],DigitCount[#,3,0]==1&&DigitCount[#,3,1]==2&] (* Harvey P. Dale, Aug 19 2019 *)

PARI

is(n)=my(d=digits(n,3),fr=vector(3));for(i=1,#d,fr[d[i]+1]++);fr[1]==1&&fr[2]==2 \\ David A. Corneth, Aug 19 2019