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A108332
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Integers n such that 10^n-89 is prime.
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2
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OFFSET
| 1,1
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COMMENTS
| 637 corresponds to a certified prime (Primo 2.2.0 beta). - Ryan Propper (rpropper(AT)stanford.edu), Nov 06 2005
No additional terms <40000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "9w11".
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LINKS
| Makoto Kamada, List of near-repdigit-related prime numbers.
Index entries for primes involving repunits.
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EXAMPLE
| n = 3 is a member because: 10^3-89 = 1000-89 = 911, which is prime.
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MATHEMATICA
| Do[If[PrimeQ[10^n - 89], Print[n]], {n, 2, 10^4}] (Propper)
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CROSSREFS
| Cf. A089675, A095714, A092767.
Sequence in context: A090510 A004887 A165770 * A066685 A076155 A136611
Adjacent sequences: A108329 A108330 A108331 * A108333 A108334 A108335
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KEYWORD
| nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
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EXTENSIONS
| a(5) from Robert Price (pamandbobprice(AT)yahoo.com), Dec 15 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
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