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A128000
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Numbers n such that (28^n - 1)/27 is prime.
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13
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OFFSET
| 1,1
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REFERENCES
| H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
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LINKS
| H. Lifchitz, Mersenne and Fermat primes field
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MATHEMATICA
| Select[Prime[Range[100]], PrimeQ[(28^#-1)/27]&]
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CROSSREFS
| Cf. A028491, A004061, A004062, A004063, A004023, A005808, A004064, A016054, A006032, A006033, A006034, A006035. Cf. A127995, A127996, A127997, A127998, A127999, A098438, A128002, A128003, A128004, A128005.
Sequence in context: A111635 A041455 A081465 * A124374 A113617 A117839
Adjacent sequences: A127997 A127998 A127999 * A128001 A128002 A128003
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 11 2007
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EXTENSIONS
| 1423 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
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