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A234101
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Primes of the form (p*q*r - 1)/2, where p, q, r are distinct primes.
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4
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97, 127, 199, 227, 241, 277, 307, 313, 331, 379, 397, 457, 467, 547, 617, 619, 647, 709, 727, 739, 757, 773, 797, 829, 883, 977, 1033, 1069, 1117, 1123, 1171, 1193, 1277, 1297, 1303, 1319, 1423, 1447, 1459, 1483, 1609, 1621, 1667, 1697, 1699, 1747, 1753
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OFFSET
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1,1
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LINKS
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EXAMPLE
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MATHEMATICA
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t = Select[Range[1, 10000, 2], Map[Last, FactorInteger[#]] == Table[1, {3}] &]; Take[(t - 1)/2, 120] (* A234099 *)
v = Flatten[Position[PrimeQ[(t - 1)/2], True]] ; w = Table[t[[v[[n]]]], {n, 1, Length[v]}] (* A234100 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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