A023735 Numbers with exactly 2 3's in their base-5 expansion.

18, 43, 68, 78, 83, 88, 90, 91, 92, 94, 98, 118, 143, 168, 193, 203, 208, 213, 215, 216, 217, 219, 223, 243, 268, 293, 318, 328, 333, 338, 340, 341, 342, 344, 348, 368, 378, 383, 388, 390, 391, 392, 394, 398, 403, 408, 413, 415, 416, 417, 419, 423

Offset

1,1

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Maple

seq(`if`(numboccur(3, convert(n, base, 5))=2, n, NULL), n=0..450); # Nathaniel Johnston, Jun 27 2011

Mathematica

Select[ Range[ 450 ], (Count[ IntegerDigits[ #, 5 ], 3 ]==2)& ]
Select[Range[500], DigitCount[#, 5, 3]==2&] (* Harvey P. Dale, Mar 24 2021 *)

Crossrefs

Cf. A023733, A023734.

Sequence in context: A252747 A067750 A043362 * A045300 A045189 A044095

Adjacent sequences: A023732 A023733 A023734 * A023736 A023737 A023738

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved