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A220144
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The values of k in A220143.
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2
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4, 6, 9, 18, 24, 42, 54, 120, 258, 396, 420, 594, 744, 840, 1074, 1800, 2130, 2172, 2256, 2304, 2550, 2778, 3282, 3792, 3894, 4170, 4488, 4578, 4626, 4848, 5562, 5754, 6192, 6252, 7260, 7428, 7920, 9654
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..38.
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MATHEMATICA
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t = {{1, 4}}; Do[k = 1; While[! (PrimeQ[k*n - 1] && PrimeQ[k*n + 1]), k++]; If[k > t[[-1, 2]], AppendTo[t, {n, k}]], {n, 2, 100000}]; Transpose[t][[2]]
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CROSSREFS
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Cf. A071558, A220143.
Sequence in context: A036667 A056016 A231997 * A346591 A152002 A171127
Adjacent sequences: A220141 A220142 A220143 * A220145 A220146 A220147
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KEYWORD
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nonn,more
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AUTHOR
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T. D. Noe, Jan 08 2013
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EXTENSIONS
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More terms from Amiram Eldar, Dec 30 2019
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STATUS
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approved
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