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A023719 Numbers with exactly 2 3's in base 4 expansion. 1
15, 31, 47, 51, 55, 59, 60, 61, 62, 79, 95, 111, 115, 119, 123, 124, 125, 126, 143, 159, 175, 179, 183, 187, 188, 189, 190, 195, 199, 203, 204, 205, 206, 211, 215, 219, 220, 221, 222, 227, 231, 235, 236, 237, 238, 240, 241, 242 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MATHEMATICA

Select[ Range[ 260 ], (Count[ IntegerDigits[ #, 4 ], 3 ]==2)& ]

CROSSREFS

Sequence in context: A041440 A042017 A043346 * A031467 A045063 A044076

Adjacent sequences:  A023716 A023717 A023718 * A023720 A023721 A023722

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified February 14 09:48 EST 2012. Contains 205614 sequences.