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A112772
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Semiprimes of the form 6n+2.
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5
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14, 26, 38, 62, 74, 86, 122, 134, 146, 158, 194, 206, 218, 254, 278, 302, 314, 326, 362, 386, 398, 422, 446, 458, 482, 542, 554, 566, 614, 626, 662, 674, 698, 734, 746, 758, 794, 818, 842, 866, 878, 914, 926, 974, 998, 1046, 1082, 1094, 1142, 1154, 1202, 1214
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OFFSET
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1,1
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COMMENTS
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Rado showed that for a given Bernoulli number B_n there exist infinitely many Bernoulli numbers B_m having the same denominator. As a special case, if n = 2p where p is an odd prime p == 1 (mod 3), then the denominator of the Bernoulli number B_n equals 6. - Bernd C. Kellner, Mar 21 2018
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LINKS
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FORMULA
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MATHEMATICA
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Select[6Range[0, 300]+2, PrimeOmega[#]==2&] (* Harvey P. Dale, Oct 04 2011 *)
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PROG
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(Magma) IsSemiprime:= func<n | &+[d[2]: d in Factorization(n)] eq 2>; [s: n in [0..210] | IsSemiprime(s) where s is 6*n + 2]; // Vincenzo Librandi, Sep 22 2012
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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