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Take square root of previous term.
1

%I #4 Mar 30 2012 16:51:14

%S 115792089237316195423570985008687907853269984665640564039457584007913129639936,

%T 340282366920938463463374607431768211456,18446744073709551616,

%U 4294967296,65536,256,16,4,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1

%N Take square root of previous term.

%Y A001146 read backwards.

%K nonn

%O 1,1

%A b5142(AT)hotmail.com, Jan 23 2009

%E Edited with the addition of 4 leading terms. - _N. J. A. Sloane_, Jan 24 2009