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A099135
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a(n) = smallest number m, not occurring earlier, such that a(k)+m is a square for some k<n; a(1) = 1.
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1
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1, 3, 6, 8, 10, 13, 12, 4, 5, 11, 14, 2, 7, 9, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72
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OFFSET
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1,2
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COMMENTS
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Permutation of the natural numbers with inverse A099136;
a(n) <> n iff 1 < n <= 14.
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LINKS
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Table of n, a(n) for n=1..72.
Index entries for sequences that are permutations of the natural numbers
Index to sequences with linear recurrences with constant coefficients, signature (2,-1).
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PROG
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(PARI) a(n)=if(n>14, n, [1, 3, 6, 8, 10, 13, 12, 4, 5, 11, 14, 2, 7, 9][n]) \\ Charles R Greathouse IV, Sep 02 2011
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CROSSREFS
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Cf. A048761, A068527.
Sequence in context: A159061 A180398 A128420 * A189471 A169863 A047282
Adjacent sequences: A099132 A099133 A099134 * A099136 A099137 A099138
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KEYWORD
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nonn,easy,changed
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AUTHOR
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Reinhard Zumkeller, Sep 29 2004
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STATUS
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approved
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