A235202 Numbers written in an alternating binary-then-quaternary base.

1, 10, 11, 20, 21, 30, 31, 100, 101, 110, 111, 120, 121, 130, 131, 1000, 1001, 1010, 1011, 1020, 1021, 1030, 1031, 1100, 1101, 1110, 1111, 1120, 1121, 1130, 1131, 2000, 2001, 2010, 2011, 2020, 2021, 2030, 2031, 2100

Offset: 1

Author

Jeremy Gardiner, Jan 04 2014

Keywords

• nonn
• base

Comments

Mixed-radix number representation produced by a serial counter with generating sequence (1, 3, 1, 3, ...) = A010684.

Places reading from the right have values (1, 2, 8, 16, 64, 128, ...) = unsigned A094014.

Conjecture: This sequence interpreted as quaternary (base 4) numbers gives A126001 (hence a simplified scheme for computing that sequence).

Examples

			a(15) = 131 since 15 = 1*1+3*2+1*8.
		

Links

• Jeremy Gardiner, Table of n, a(n) for n = 1..1024

Crossrefs

Cf. A109827 (Numbers written in an alternating binary-then-ternary base).