

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
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OFFSET

0,2


LINKS



EXAMPLE

a(123) = 328 : 123 > 101001000 > 328.


CROSSREFS



KEYWORD

base,easy,nonn


AUTHOR



STATUS

approved



