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 A031449 Numbers whose base-2 representation has two fewer 0's than 1's. 1
 3, 11, 13, 14, 39, 43, 45, 46, 51, 53, 54, 57, 58, 60, 143, 151, 155, 157, 158, 167, 171, 173, 174, 179, 181, 182, 185, 186, 188, 199, 203, 205, 206, 211, 213, 214, 217, 218, 220, 227, 229, 230, 233, 234, 236, 241, 242, 244, 248, 543, 559, 567, 571, 573, 574 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE 13 in binary is 1101, which has three 1's but only one 0, hence 13 is in the sequence. 14 in binary is 1110, which has three 1's but only one 0, hence 14 is in the sequence. 15 in binary is 1111, which has four 1's but no significant 0's, hence 15 is not in the sequence. MATHEMATICA Select[Range[700], DigitCount[#, 2, 0] == DigitCount[#, 2, 1] - 2 &] (* Vincenzo Librandi, Aug 24 2013 *) CROSSREFS Cf. A007088, A023416, A080791 (these two sequences are identical except for a(0), which is irrelevant for this sequence because 0 has no 1's). Sequence in context: A254220 A119231 A177335 * A305859 A090260 A179522 Adjacent sequences: A031446 A031447 A031448 * A031450 A031451 A031452 KEYWORD nonn,easy,base AUTHOR Clark Kimberling EXTENSIONS More terms from Vincenzo Librandi, Aug 24 2013 STATUS approved

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Last modified April 23 22:36 EDT 2024. Contains 371917 sequences. (Running on oeis4.)