A045221 Numbers whose base-5 representation contains exactly one 1 and no 2's.

1, 5, 8, 9, 16, 21, 25, 28, 29, 40, 43, 44, 45, 48, 49, 76, 80, 83, 84, 91, 96, 101, 105, 108, 109, 116, 121, 125, 128, 129, 140, 143, 144, 145, 148, 149, 200, 203, 204, 215, 218, 219, 220, 223, 224, 225, 228, 229, 240, 243, 244, 245

Offset

1,2

Links

Table of n, a(n) for n=1..52.

Mathematica

Select[Range[250], DigitCount[#, 5, 1]==1&&DigitCount[#, 5, 2]==0&] (* Harvey P. Dale, Dec 26 2021 *)

Crossrefs

Cf. A007091.

Sequence in context: A287551 A231065 A314576 * A046287 A051220 A102785

Adjacent sequences: A045218 A045219 A045220 * A045222 A045223 A045224

Keyword

nonn,base

Author

Clark Kimberling

Status

approved