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Search: id:A048880
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| A048880 |
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Primes of form pq+2 where p and q are consecutive primes. |
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+0
6
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| 17, 37, 79, 223, 439, 4759, 22501, 32401, 53359, 57601, 60493, 72901, 77839, 95479, 99223, 159199, 164011, 176401, 194479, 239119, 324901, 378223, 416023, 497011, 680623, 756853, 804511, 1115113, 1664101, 1742401, 2223079
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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EXAMPLE
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487*491+2=239119.
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MAPLE
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with (numtheory): for n from 1 to 1000 do if (tau(ithprime(n)*ithprime(n+1)+2)=2) then print(ithprime(n), ithprime(n+1), ithprime(n)*ithprime(n+1)+2); fi; od;
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MATHEMATICA
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ct = 0; Do[If[PrimeQ[Prime[k]*Prime[k + 1] + 2], ct++; n[ct] = Prime[k]*Prime[k + 1] + 2], {k, 1, 430}]; Table[n[k], {k, 1, ct}] (Lei Zhou)
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CROSSREFS
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Cf. A051507.
Adjacent sequences: A048877 A048878 A048879 this_sequence A048881 A048882 A048883
Sequence in context: A059425 A050952 A093930 this_sequence A075892 A141886 A060429
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KEYWORD
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easy,nonn,nice
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net)
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EXTENSIONS
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Corrected and extended by Joe DeMaio (jdemaio(AT)kennesaw.edu).
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