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Search: id:A092127
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| A092127 |
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Numbers n such that n, n+2, n+4, n+6, n+8 are semiprimes. |
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+0
10
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| 213, 1133, 1343, 1383, 1385, 1835, 1937, 2315, 2807, 3091, 3093, 3095, 3147, 3977, 4313, 4529, 4835, 5089, 5609, 5611, 6185, 6533, 7141, 8129, 8131, 8133, 8135, 9753, 9755, 9983, 9985, 9987, 9989, 10401, 10403, 11013, 11015, 11099, 11663, 12053
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Semiprimes in arithmetic progression. All terms are odd, see also A056809.
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MATHEMATICA
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PrimeFactorExponentsAdded[n_] := Plus @@ Flatten[Table[ #[[2]], {1}] & /@ FactorInteger[n]]; Select[ Range[ 12054], PrimeFactorExponentsAdded[ # ] == PrimeFactorExponentsAdded[ # + 2] == PrimeFactorExponentsAdded[ # + 4] == PrimeFactorExponentsAdded[ # + 6] == PrimeFactorExponentsAdded[ # + 8] == 2 &] (from Robert G. Wilson v Feb 24 2004)
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CROSSREFS
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Cf. A056809, A070552, A092125, A092126, A092128, A092129.
Sequence in context: A138568 A092126 A085309 this_sequence A082967 A092796 A076159
Adjacent sequences: A092124 A092125 A092126 this_sequence A092128 A092129 A092130
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 22 2004
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