

A031449


Numbers n which in base 2 have 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
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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. 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



