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A078586
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a(n) is the product of the first n primes of the form 4k+3.
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4
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3, 21, 231, 4389, 100947, 3129357, 134562351, 6324430497, 373141399323, 25000473754641, 1775033636579511, 140227657289781369, 11638895555051853627, 1198806242170340923581, 128272267912226478823167
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)+2 is a prime for n=1,2,3,4,8,10,12,17,19,22,23,53.
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..100
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MATHEMATICA
| maxN=15; pLst={}; k=0; While[Length[pLst]<maxN, k++; If[PrimeQ[4k-1], AppendTo[pLst, 4k-1]]]; lst=Drop[FoldList[Times, 1, pLst], 1]
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CROSSREFS
| Cf. A002110, A006278.
Sequence in context: A119097 A008545 A005373 * A179331 A138903 A058562
Adjacent sequences: A078583 A078584 A078585 * A078587 A078588 A078589
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KEYWORD
| easy,nonn
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AUTHOR
| T. D. Noe (noe(AT)sspectra.com), Dec 01 2002
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