login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

a(n) = 81 written in base n.
0

%I #8 Mar 30 2012 16:49:58

%S 111111111111111111111111111111111111111111111111111111111111111111111111111111111,

%T 1010001,10000,1101,311,213,144,121,100,81,74,69,63

%N a(n) = 81 written in base n.

%C The next term contains a non-decimal digit.

%C The term 111....1111 should officially be called the "unary expansion", since in base 1 only the digit 0 may appear.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Jun 04 2004