

A099135


a(n) = smallest number m, not occurring earlier, such that a(k)+m is a square for some k<n; a(1) = 1.


1



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

1,2


COMMENTS

Permutation of the natural numbers with inverse A099136;
a(n) <> n iff 1 < n <= 14.


LINKS



PROG

(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


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



