The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A101440 Replace each digit of n with 1 followed by n 0's: 0 -> 1, 1 -> 10, 2 -> 100, ..., 9 -> 1000000000, 10 -> 101, 11 -> 1010, 12 -> 10100, etc. Expanded number is then converted from binary to decimal: 0 -> 1 -> 1, 1 -> 10 -> 2, 2 -> 100 -> 4, 9 -> 1000000000 -> 512, 10 -> 101 -> 5, etc. 0
 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 5, 10, 20, 40, 80, 160, 320, 640, 1280, 2560, 9, 18, 36, 72, 144, 288, 576, 1152, 2304, 4608, 17, 34, 68, 136, 272, 544, 1088, 2176, 4352, 8704, 33, 66, 132, 264, 528, 1056, 2112, 4224, 8448, 16896, 65, 130, 260, 520, 1040 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..54. EXAMPLE a(123) = 328 : 123 -> 101001000 -> 328. CROSSREFS Sequence in context: A085941 A054842 A290389 * A126605 A072067 A072049 Adjacent sequences: A101437 A101438 A101439 * A101441 A101442 A101443 KEYWORD base,easy,nonn AUTHOR Felix Tubiana, Jan 18 2005 STATUS approved

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

Last modified December 5 05:37 EST 2023. Contains 367575 sequences. (Running on oeis4.)