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 A328012 Numbers whose binary representations start and end with 1 and contain an even number of zeros between. 1
 1, 3, 7, 9, 15, 19, 21, 25, 31, 33, 39, 43, 45, 51, 53, 57, 63, 67, 69, 73, 79, 81, 87, 91, 93, 97, 103, 107, 109, 115, 117, 121, 127, 129, 135, 139, 141, 147, 149, 153, 159, 163, 165, 169, 175, 177, 183, 187, 189, 195, 197, 201, 207, 209, 215, 219, 221, 225 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Odd members of A059010. - Robert Israel, Nov 30 2019 LINKS Jonathan Frech, Table of n, a(n) for n = 1..10000 MAPLE q:= n-> (l-> l[1]=1 and add(1-i, i=l)::even)(Bits[Split](n)): select(q, [\$1..300])[];  # Alois P. Heinz, Oct 04 2019 MATHEMATICA {1}~Join~Select[Range[3, 225, 2], EvenQ@ DigitCount[#, 2, 0] &] (* Michael De Vlieger, Oct 05 2019 *) PROG (PARI) ok(n)={n%2 && hammingweight((2< 0:         d, aa = aa%2, aa//2         if d == 0:             k = k+1     if k%2 == 0:         n = n+1         print(n, a)     a = a+2 # A.H.M. Smeets, Oct 04 2019 CROSSREFS Cf. A023416, A059010. Sequence in context: A187108 A026175 A026139 * A292911 A119681 A197625 Adjacent sequences:  A328009 A328010 A328011 * A328013 A328014 A328015 KEYWORD nonn,base AUTHOR Justin Clifton, Oct 01 2019 EXTENSIONS More terms from Alois P. Heinz, Oct 04 2019 STATUS approved

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Last modified November 25 11:18 EST 2020. Contains 338623 sequences. (Running on oeis4.)