[seqfan] Re: A165783 Formula for period of shift register stages

[Joerg Arndt]

* c.zizka at email.cz <c.zizka at email.cz> [Nov 24. 2009 09:12]:
> Richard,
> 
> the sequence is a(n)=n+digitsum((2^n)-1))/(2*n-1)). Digitsum(z) in base 2.
> 

Parse error: the parentheses do not match.
Please correct.

Please also add code and more terms.