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A073842
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a(1) = 1; for n>1, a(n) = the smallest positive integer root of n not included earlier, if such a root exists, otherwise the smallest power of n not included earlier, subject to a(n)<>n.
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1
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1, 4, 9, 2, 25, 36, 49, 64, 3, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 5, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 6, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 7, 2500, 2601, 2704
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OFFSET
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1,2
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COMMENTS
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Conjectured to be a rearrangement of the natural numbers.
This is a self-inverse permutation of the positive integers, as shown by the formula. - Franklin T. Adams-Watters, Jul 31 2006
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LINKS
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Table of n, a(n) for n=1..52.
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FORMULA
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By repeatedly taking the square root, represent n in the form m^(2^k), where m is not a square and k>=0. If k is even, a(n) = m^(2^(k+1)); if k is odd, a(n) = m^(2^(k-1)). - Franklin T. Adams-Watters, Jul 31 2006
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CROSSREFS
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Cf. A073843.
Sequence in context: A159253 A011262 A073843 * A136271 A113970 A021957
Adjacent sequences: A073839 A073840 A073841 * A073843 A073844 A073845
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy, Aug 13 2002
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EXTENSIONS
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Extended and edited by John W. Layman, Jun 25 2003
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STATUS
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approved
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