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A092767
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Numbers n such that 10^n-11 is prime.
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11
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2, 5, 8, 12, 15, 18, 20, 30, 80, 143, 152, 164, 176, 239, 291, 324, 504, 594, 983, 2894, 22226, 35371, 58437, 67863
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Some of the larger entries may only correspond to probable primes.
324, 504, 594 & 983 are certified prime by Primo. - Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 01 2005
No additional terms < 100000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "99989".
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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 = 5 is a member because 10^5-11 = 100000-11 = 99989, which is prime.
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MATHEMATICA
| Do[ If[ PrimeQ[10^n - 11], Print[n]], {n, 3000}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 01 2005)
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PROG
| (PARI) for(n=0, 5000, if(isprime(10^n-11), print1(n, ", "))) (Propper)
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CROSSREFS
| Cf. A089675, A086865, A004023, A095714.
Sequence in context: A193767 A184813 A108311 * A190000 A080753 A156745
Adjacent sequences: A092764 A092765 A092766 * A092768 A092769 A092770
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KEYWORD
| more,nonn
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AUTHOR
| Carl R. White (cyrek(AT)cyreksoft.yorks.com), Apr 23 2004
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EXTENSIONS
| 4 more terms from Ryan Propper (rpropper(AT)stanford.edu), Jun 15 2005
Edited by N. J. A. Sloane (njas(AT)research.att.com), May 04 2007
a(21)-a(22) from Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
a(23)=58437 and a(24)=67863 from Robert Price (pamandbobprice(AT)yahoo.com), May 29 2011
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