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A124602 Position of the first 2 in the decimal expansion of the square root of n, or -1 if 2 never appears. +0
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-1, -1, 5, 4, 1, 1, 1, 1, 1, -1, 4, 6, 25, 8, 28, 4, -1, 3, 2, 19, 4, 4, 12, 9, 34, -1, 13, 7, 2, 20, 5, 10, 8, 7, 25, 19, -1, 4, 10, 2, 3, 6, 17, 9, 5, 5, 4, 18, 3, -1, 17, 6, 2, 2, 8, 16, 16, 11, 17, 27, 10, 5, 31, 5, -1, 4, 3, 7, 2, 6, 8, 3, 5, 27, 4, 5, 32, 13, 12, 33, 5, -1, 18, 14, 56, 2, 2, 3, 23, 10, 7, 7, 12, 13, 13, 35, 13, 18, 24, 26, -1 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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