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Search: id:A138399
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| A138399 |
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Ennea-Primes. Prime Numbers n (single prime number in-between 8 twin primes) such that Sum of 9 prime numbers (8 twin primes and single prime number in-between) are primes. |
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+0
1
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| 4253, 626617, 1841681, 2169007, 2484931, 9198577, 9600571
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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{5 penta-} {9 ennea-} Table of non-technical numeric prefixes -- http://en.wikipedia.org/wiki/Numerical_prefix
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EXAMPLE
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{4229,4231} {4241,4243} {4253} {4259,4261} {4271,4273} Sum = 38261.
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MATHEMATICA
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a={}; Do[p0=Prime[n]; a1=Prime[n-4]; a2=Prime[n-3]; b1=Prime[n-2]; b2=Prime[n-1]; c1=Prime[n+1]; c2=Prime[n+2]; d1=Prime[n+3]; d2=Prime[n+4]; sp=a1+a2+b1+b2+p0+c1+c2+d1+d2; If[PrimeQ[sp]&&a2-a1==2&&b2-b1==2&&c2-c1==2&&d2-d1==2, AppendTo[a, p0]], {n, 5, 10^6}]; a
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CROSSREFS
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Adjacent sequences: A138396 A138397 A138398 this_sequence A138400 A138401 A138402
Sequence in context: A035899 A108007 A031985 this_sequence A023346 A101619 A124596
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KEYWORD
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nonn,uned
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), May 08 2008
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