A211864 Powers of three read in base 2.

1, 3, 9, 11, 17, 19, 41, 43, 81, 131, 169, 219, 241, 419, 681, 651, 849, 1203, 2441, 1867, 4369, 3027, 5625, 12475, 15457, 26403, 26553, 48795, 54561, 99667, 80345, 158731, 221313, 332467, 460857, 375451, 569345, 987267, 1181145, 1594971, 1924001, 4458531

Offset: 0

Author

Robert G. Wilson v, Feb 10 2013

Keywords

• nonn
• base
• easy

Examples

			a(3)=11 because 3^3=27_10 but in base 2 it is interpreted as 2*2^1+7*2^0=4+7=11. That is to say, digits larger than the base are carried.
		

Crossrefs

Cf. A004656.

Programs

Mathematica

f[n_] := FromDigits[ IntegerDigits[3^n], 2]; Array[f, 42, 0]