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A050258
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Number of prime quadruples with largest member < 10^n.
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0
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1, 2, 5, 12, 38, 166, 899, 4768, 28388, 180529, 1209318, 8398278, 60070590, 441296836, 3314576487, 25379433651
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Thomas R. Nicely, More information (1)
Thomas R. Nicely, More information (2)
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to numbers of primes in various ranges
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MATHEMATICA
| c =1; Do[ Do[ If[ PrimeQ[ n ] && PrimeQ[ n + 2 ] && PrimeQ[ n + 6 ] && PrimeQ[ n + 8 ], c++ ], {n, 10^n + 1, 10^(n + 1), 10} ]; Print[ c ], {n, 1, 15} ]
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CROSSREFS
| Cf. A007530.
Sequence in context: A130221 A036782 A050237 * A051436 A054581 A203151
Adjacent sequences: A050255 A050256 A050257 * A050259 A050260 A050261
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KEYWORD
| nonn,nice,hard
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
| a(16) (from Nicely link) added by Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 11 2011
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