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A189118
a(n) = smallest composite (odd) number greater than a(n-1) such that a(n)+2n is the first prime after a(n).
2
9, 25, 91, 119, 201, 295, 527, 891, 1133, 1341, 1671, 2479, 2973, 4299, 5593, 8469, 9553, 15691, 16145, 19621, 25481, 28233, 31423, 31909, 34073, 35619, 43337, 44295, 89695, 107381, 134519, 155943, 173363, 175143, 188037, 212705, 265629
OFFSET
1,1
COMMENTS
More precise definition from Don Reble, Jul 29 2014. (Old definition was: Smallest composite odd number of first sequence of n consecutive composite odd numbers.)
LINKS
EXAMPLE
9 is composite but 11 is not; 25 and 27 are composite but 29 is not; 91, 93, 95 are composite but 97 is not.
MATHEMATICA
imax=1000000; lst={}; q=1; Do[k=0; Do[If[PrimeQ[n], Break[], k++], {n, m, imax+200, 2}]; If[k==q, q++; AppendTo[lst, m]], {m, 5, imax, 2}]; lst
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Definition revised by N. J. A. Sloane, Jul 29 2014 at the suggestion of Don Reble.
STATUS
approved