A302205 - OEIS

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A302205

Let the binary expansion of n be [b_d, b_{d-1}, ..., b_3, b_2, b_1, b_0]_2, where (if n>0) b_d = 1, b_i = 0 or 1 for i<d. To get a(n) concatenate the decimal numbers 2^(b_i) (if b_i = 1) or 0 (if b_i = 0).

0, 1, 20, 21, 400, 401, 420, 421, 8000, 8001, 8020, 8021, 8400, 8401, 8420, 8421, 160000, 160001, 160020, 160021, 160400, 160401, 160420, 160421, 168000, 168001, 168020, 168021, 168400, 168401, 168420, 168421, 3200000, 3200001, 3200020, 3200021, 3200400, 3200401, 3200420, 3200421, 3208000, 3208001, 3208020, 3208021, 3208400, 3208401, 3208420, 3208421, 32160000

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OFFSET

0,3

COMMENTS

First differs from A063012 (which uses base 20) at n = 48, where A063012(48) = 3360000, whereas here a(48) = 32160000.

LINKS

Table of n, a(n) for n=0..48.

EXAMPLE

48_10 = 110000_2, so a(48) is the concatenation of 32, 16, 0, 0, 0, 0 = 32160000.

CROSSREFS

Cf. A063012.

Sequence in context: A063013 A028931 A063012 * A041836 A041837 A041838