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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: A278017 A270849 A097731 * A171391 A151738 A128312
Adjacent sequences: A006240 A006241 A006242 * A006244 A006245 A006246
N. J. A. Sloane.