A004646 Powers of 2 written in base 7.

1, 2, 4, 11, 22, 44, 121, 242, 514, 1331, 2662, 5654, 14641, 32612, 65524, 164351, 362032, 1054064, 2141161, 4312352, 11625034, 23553101, 50436202, 131205404, 262414111, 555131222, 1443262444, 3216555221, 6436443442, 16206220214, 35415440431, 104134211162

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Programs

Magma

[Seqint(Intseq(2^n, 7)): n in [0..30]]; // G. C. Greubel, Sep 10 2018

Mathematica

Table[FromDigits[IntegerDigits[2^n, 7]], {n, 0, 40}] (* Vladimir Joseph Stephan Orlovsky, Feb 17 2012 *)

PARI

for(n=0,30, print1(fromdigits(digits(2^n, 7)), ", ")) \\ G. C. Greubel, Sep 10 2018