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%I #12 Apr 20 2022 18:47:38
%S 0,3,7,7,25,15,63,31,125,63,187,127,1081,255,1091,511,1247,1023,11217,
%T 2047,11999,4095,20259,8191,66077,16383,88609,32767,55491,65535,
%U 284231,131071,413199,262143,585102,524287,3351311,1048575,3462843,2097151
%N Sum of terms in periodic part of continued fraction expansion of square root of -1+2^n.
%H Chai Wah Wu, <a href="/A077629/b077629.txt">Table of n, a(n) for n = 1..80</a>
%F a(2*n) = 2^(n+1) - 1. - _Max Alekseyev_, May 13 2010
%t Table[Apply[Plus, Last[ContinuedFraction[Sqrt[ -1+2^u]]]], {u, 1, 25}]
%Y Cf. A077624-A077635.
%K nonn
%O 1,2
%A _Labos Elemer_, Nov 13 2002
%E a(1) corrected, a(26) and on added by _Max Alekseyev_, May 13 2010
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