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Search: id:A092129
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| A092129 |
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Numbers n such that n, n+2, n+4, n+6, n+8, n+10, n+12 are semiprimes. |
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+0
11
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| 3091, 8129, 8131, 9983, 9985, 55559, 92603, 99443, 99445, 112709, 132077, 132079, 182749, 190937, 190939, 209479, 237449, 237451, 239089, 249689, 296779, 300449, 313411, 401429, 401431, 441677, 441679, 452639, 452641, 547157, 604487, 604489
(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[ 631200], PrimeFactorExponentsAdded[ # ] == PrimeFactorExponentsAdded[ # + 2] == PrimeFactorExponentsAdded[ # + 4] == PrimeFactorExponentsAdded[ # + 6] == PrimeFactorExponentsAdded[ # + 8] == PrimeFactorExponentsAdded[ # + 10] == PrimeFactorExponentsAdded[ # + 12] == 2 &] (from Robert G. Wilson v Feb 24 2004)
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CROSSREFS
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Cf. A056809, A070552, A092125, A092126, A092127, A092128.
Sequence in context: A137485 A045083 A045079 this_sequence A103523 A090056 A002433
Adjacent sequences: A092126 A092127 A092128 this_sequence A092130 A092131 A092132
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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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EXTENSIONS
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More terms from Don Reble (djr(AT)nk.ca), Feb 23 2004
More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 24 2004
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