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

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

Adjacent sequences: A302202 A302203 A302204 * A302206 A302207 A302208

Keyword

nonn,base

Author

N. J. A. Sloane, Apr 26 2018

Extensions

More than the usual number of terms are displayed in order to distinguish this from A063012.

Status

approved