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 A083569 Smallest m not occurring earlier such that m+n is prime. 4
 1, 3, 2, 7, 6, 5, 4, 9, 8, 13, 12, 11, 10, 15, 14, 21, 20, 19, 18, 17, 16, 25, 24, 23, 22, 27, 26, 31, 30, 29, 28, 35, 34, 33, 32, 37, 36, 41, 40, 39, 38, 47, 46, 45, 44, 43, 42, 49, 48, 51, 50, 55, 54, 53, 52, 57, 56, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 79, 78, 77 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(a(n))=n: a self-inverse permutation with A010051(a(n)+n)=1. - Reinhard Zumkeller, Nov 25 2004 LINKS Paul Tek, Table of n, a(n) for n = 1..1000 PROG (PARI) A083569(n)={global(a083569); type(a083569)=="t_VEC"||a083569=vector(n); #a0835691&&u[2]==u[1]+1, u=u[2..-1])); a083569[n]} \\ Returns the n-th term and defines the global array a083569 up to that value at least. For efficiency it is better to (pre)compute a large number of terms at once (via A083569(N_max)) rather than one after the other. - M. F. Hasler, Apr 11 2015 CROSSREFS Cf. A084721. Cf. A071065. Sequence in context: A072764 A130328 A228993 * A071574 A276344 A276343 Adjacent sequences:  A083566 A083567 A083568 * A083570 A083571 A083572 KEYWORD nonn AUTHOR Amarnath Murthy, Jun 12 2003 EXTENSIONS More terms from David Wasserman, Nov 19 2004 STATUS approved

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