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A157359
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Quatro-safe primes.
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1
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47, 1439, 2879, 858239, 861599, 982559, 1014719, 1067999, 2029439, 2034239, 2297759, 2683679, 2978399, 3301919, 4068479, 4288799, 4737599, 5454719, 6484319, 6753119, 7145759, 8624159, 9511199, 9717119, 10533599, 10739999
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| (47-1)/2=23,(23-1)/2=11,(11-1)/2=5,(5-1)/2=2(prime),...
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MATHEMATICA
| lst={}; Do[p=Prime[n]; If[PrimeQ[a=(p-1)/2]&&PrimeQ[b=(a-1)/2]&&PrimeQ[c=(b-1)/2]&&PrimeQ[(c-1)/2], AppendTo[lst, p]], {n, 10!}]; lst
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CROSSREFS
| Cf. A005385, A066179, A157357, A157358
Sequence in context: A010999 A047911 A009069 * A153214 A142845 A202128
Adjacent sequences: A157356 A157357 A157358 * A157360 A157361 A157362
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 27 2009
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