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Search: id:A092767
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| A092767 |
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Numbers n such that 10^n-11 is prime. |
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+0
12
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| 2, 5, 8, 12, 15, 18, 20, 30, 80, 143, 152, 164, 176, 239, 291, 324, 504, 594, 983, 2894
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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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
Next term after 2894 is greater than 7250. - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 05 2007
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EXAMPLE
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n = 5 is a member because 10^5-11 = 100000-11 = 99989, which is prime.
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MATHEMATICA
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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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PROGRAM
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(PARI) for(n=0, 5000, if(isprime(10^n-11), print1(n, ", "))) (Propper)
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CROSSREFS
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Cf. A089675, A086865, A004023, A095714/.
Adjacent sequences: A092764 A092765 A092766 this_sequence A092768 A092769 A092770
Sequence in context: A004112 A024815 A073837 this_sequence A108311 A080753 A156745
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KEYWORD
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more,nonn
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AUTHOR
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Carl R. White (cyrek(AT)cyreksoft.yorks.com), Apr 23 2004
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EXTENSIONS
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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
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