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A098471
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Least k such that Mersenne-prime(n)*2^k+1 is prime (A000668(n)*2^k+1).
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1
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1, 2, 8, 2, 12, 864, 4, 10, 8, 72, 18, 38, 2144, 178, 472, 974, 2200, 8128, 4580, 822, 3600, 4100
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| mexp = {the list in A000043}; f[n_] := Block[{k = 1, mp = 2^mexp[[n]] - 1}, While[ !PrimeQ[mp*2^k + 1] && k < 10000, k++ ]; If[k == 10000, 0, k]]; Do[ Print[ f[n]], {n, 22}] (from Robert G. Wilson v Sep 13 2004)
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CROSSREFS
| Cf. A098472.
Sequence in context: A010466 A086396 A195844 * A074723 A175183 A189217
Adjacent sequences: A098468 A098469 A098470 * A098472 A098473 A098474
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Sep 09 2004
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EXTENSIONS
| a(18) - a(22) from Robert G. Wilson v Sep 13 2004
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