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 A111296 Smallest prime of the form n*k + 1, where each k may be used in the sequence only once. 1
 2, 5, 13, 13, 31, 31, 71, 73, 73, 71, 199, 157, 157, 197, 241, 241, 409, 199, 419, 401, 547, 419, 691, 409, 701, 547, 919, 701, 929, 691, 1117, 929, 1321, 919, 1471, 1117, 1777, 1483, 1483, 1321, 2297, 1471, 1979, 2069, 2251, 1979, 2069, 1777, 2549, 2251 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(10) = 10*13 + 1 = 131 though 10*10 + 1 = 101 is also prime but k=10 has already been used by n=7. MATHEMATICA l = {}; Do[k = 1; While[MemberQ[l, k] || !PrimeQ[n*k + 1], k++ ]; Print[n*k+1]; AppendTo[l, k], {n, 30}] (* Ryan Propper, Jun 15 2006 *) CROSSREFS Cf. A087559. Sequence in context: A067365 A189993 A112838 * A089728 A127987 A247543 Adjacent sequences:  A111293 A111294 A111295 * A111297 A111298 A111299 KEYWORD nonn AUTHOR Amarnath Murthy, Nov 11 2005 EXTENSIONS Corrected and extended by Ryan Propper, Jun 15 2006 More terms from R. J. Mathar, Aug 20 2007 STATUS approved

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Last modified May 17 08:05 EDT 2022. Contains 353741 sequences. (Running on oeis4.)