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Search: id:A050258
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| A050258 |
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Number of prime quadruples with largest member < 10^n. |
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+0
1
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| 1, 2, 5, 12, 38, 166, 899, 4768, 28388, 180529, 1209318, 8398278, 60070590, 441296836, 3314576487
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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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
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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
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Cf. A007530.
Sequence in context: A130221 A036782 A050237 this_sequence A051436 A054581 A140440
Adjacent sequences: A050255 A050256 A050257 this_sequence A050259 A050260 A050261
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KEYWORD
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nonn,nice,hard
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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