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.

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

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