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A156592
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Product p*q of two primes with q = 2*p + 1.
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2
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10, 21, 55, 253, 1081, 1711, 3403, 5671, 13861, 15931, 25651, 34453, 60031, 64261, 73153, 108811, 114481, 126253, 158203, 171991, 258121, 351541, 371953, 392941, 482653, 518671, 703891, 822403, 853471, 869221, 933661, 1034641, 1104841
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) = A005384(n)*A005385(n);
subsequence of A068443.
Math Marathon (MM95): http://dxdy.ru/topic16349.html [From Vladimir Orlovsky (4vladimir(AT)gmail.com), May 12 2010]
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MATHEMATICA
| lst={}; Do[p=Prime[n]; q=2*p+1; If[PrimeQ[q], AppendTo[lst, p*q]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), May 12 2010]
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CROSSREFS
| Sequence in context: A042309 A048697 A090076 * A045973 A095679 A095192
Adjacent sequences: A156589 A156590 A156591 * A156593 A156594 A156595
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 10 2009
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