A023730 Numbers with a single 2 in their base 5 expansion.

2, 7, 10, 11, 13, 14, 17, 22, 27, 32, 35, 36, 38, 39, 42, 47, 50, 51, 53, 54, 55, 56, 58, 59, 65, 66, 68, 69, 70, 71, 73, 74, 77, 82, 85, 86, 88, 89, 92, 97, 102, 107, 110, 111, 113, 114, 117, 122, 127, 132, 135, 136, 138, 139, 142, 147

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Mathematica

Select[ Range[ 150 ], (Count[ IntegerDigits[ #, 5 ], 2 ]==1)& ]
Select[Range[200], DigitCount[#, 5, 2]==1&] (* Harvey P. Dale, Sep 23 2023 *)

Crossrefs

Sequence in context: A362861 A194421 A043357 * A045281 A050596 A045266

Adjacent sequences: A023727 A023728 A023729 * A023731 A023732 A023733

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved