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Search: id:A154668
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| A154668 |
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Averages of twin prime pairs such that p1*p2-+AverageTwinPrime=primes. |
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+0
1
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| 4, 6, 60, 420, 2730, 8970, 11970, 21840, 28620, 29130, 44130, 48120, 55050, 56100, 61980, 74160, 84390, 87540, 111270, 111870, 143880, 176550, 191670, 207510, 227610, 229590, 233550, 251220, 258330, 281580, 324450, 343770, 356820, 390000
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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3*5-4=11,3*5+4=19, 5*7-6=29,5*7+6=41,...
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MATHEMATICA
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lst={}; Do[If[PrimeQ[n-1]&&PrimeQ[n+1], If[PrimeQ[(n-1)*(n+1)-n]&&PrimeQ[(n-1)*(n+1)+n], AppendTo[lst, n]]], {n, 2*9!}]; lst
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CROSSREFS
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Cf. A154666, A154667
Sequence in context: A089630 A058162 A132929 this_sequence A053489 A012898 A013080
Adjacent sequences: A154665 A154666 A154667 this_sequence A154669 A154670 A154671
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 13 2009
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