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Search: id:A157354
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| A157354 |
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Products of 3 distinct safe primes. |
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+0
5
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| 385, 805, 1265, 1645, 1771, 2065, 2585, 2905, 3245, 3619, 3745, 4543, 4565, 5405, 5845, 5885, 6265, 6391, 6785, 7567, 7945, 8239, 9185, 9205, 9499, 9545, 9845, 11891, 12145, 12305, 12485, 12565, 12859, 13363, 13405, 13783, 13865, 14465, 14927
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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385=5*7*11; 5,7 and 11 are safe prime numbers,...
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MATHEMATICA
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lst={}; Do[If[Plus@@Last/@FactorInteger[n]==3, a=Length[First/@FactorInteger[n]]; If[a==3, b=First/@FactorInteger[n]; c=b[[1]]; d=b[[2]]; e=b[[3]]; If[PrimeQ[(c-1)/2]&&PrimeQ[(d-1)/2]&&PrimeQ[(e-1)/2], AppendTo[lst, n]]]], {n, 7!}]; lst
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CROSSREFS
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Cf. A001358, A005384, A005385, A006881, A007304, A111206, A157342, A157344, A157345, A157346, A157347, A157352, A157353
Sequence in context: A069043 A013591 A152941 this_sequence A065110 A063390 A130612
Adjacent sequences: A157351 A157352 A157353 this_sequence A157355 A157356 A157357
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 27 2009
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