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%I #9 Dec 05 2013 19:56:46
%S 1,4,36,16,900,64,15876,256,47524,1024,386884,4096,67076100,16384,
%T 21921124,65536,17179344900,262144,274875809796,1048576,148371336100,
%U 4194304,9206236135684,16777216,1167694198801,67108864,367640742081600,268435456,3836162239297600
%N Least square of the form 'sum of n successive terms of a geometric progression + 1', or 0 if no such square exists.
%C Conjecture: No term is zero.
%C If n is even, a(n) = 2^n. - _Ray G. Opao_, Feb 25 2005
%e a(3) = 36 = (5 + 10 + 20) + 1. a(4) = 16 = (1 + 2 + 4 + 8) + 1.
%Y Cf. A092959.
%K nonn
%O 1,2
%A _Amarnath Murthy_, Mar 25 2004
%E Corrected and extended by _Ray G. Opao_, Feb 25 2005
%E a(11)-a(27) from _Donovan Johnson_, May 20 2010
%E a(28)-a(29) from _Donovan Johnson_, Sep 20 2012