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E. B. Escott, Rapid method for extracting a square root, Amer. Math. Monthly, 44 (1937), 644-646.
Jeffrey Shallit, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=0..3.
Sequence in context: A015008 A194791 A159869 * A163566 A168520 A200993
Adjacent sequences: A006239 A006240 A006241 * A006243 A006244 A006245
N. J. A. Sloane.