This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A253608 The binary representation of a(n) is the concatenation of n and the binary complement of n, A035327(n). 3
 2, 9, 12, 35, 42, 49, 56, 135, 150, 165, 180, 195, 210, 225, 240, 527, 558, 589, 620, 651, 682, 713, 744, 775, 806, 837, 868, 899, 930, 961, 992, 2079, 2142, 2205, 2268, 2331, 2394, 2457, 2520, 2583, 2646, 2709, 2772, 2835, 2898, 2961, 3024, 3087, 3150, 3213 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (n+1) * (2^BL(n) - 1), where BL(n) is the binary length of n. MAPLE a:= n-> (n+1)*(2^(ilog2(n)+1)-1): seq(a(n), n=1..50);  # Alois P. Heinz, Jan 08 2015 MATHEMATICA Array[(# + 1) (2^(Floor@ Log2[#] + 1) - 1) &, 50] (* Michael De Vlieger, Oct 13 2018 *) PROG (Python) for n in range(1, 333):   print str((n+1)*(2 ** long.bit_length(long(n))-1))+', ', (PARI) a(n) = (n+1)*(2^#binary(n)-1); \\ Michel Marcus, Jan 08 2015 CROSSREFS Cf. A035327, A036044, A070939. Sequence in context: A183207 A304797 A178312 * A126977 A102237 A324571 Adjacent sequences:  A253605 A253606 A253607 * A253609 A253610 A253611 KEYWORD nonn,easy,base AUTHOR Alex Ratushnyak, Jan 05 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 15 07:56 EDT 2019. Contains 328026 sequences. (Running on oeis4.)