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A111023
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Integers n such that 9*10^n + 11 is a prime number.
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0
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1, 2, 3, 4, 6, 8, 16, 20, 27, 115, 180, 274, 576, 1111, 2404, 5127, 8082, 9514, 12808, 14752, 15926, 22670, 37432, 41988, 53707, 72595, 92742
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OFFSET
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1,2
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COMMENTS
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See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "90w11".
a(28) > 10^5. - Robert Price, Jan 28 2017
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LINKS
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Table of n, a(n) for n=1..27.
Makoto Kamada, List of near-repdigit-related prime numbers.
Index entries for primes involving repunits.
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EXAMPLE
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n = 6 is a member because 9*10^6 + 11 = 9*1000000 + 11 = 9000011, which is prime.
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MATHEMATICA
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Do[If[PrimeQ[9*10^n+11], Print[n]], {n, 1, 1300}] (* Zak Seidov, Sep 14 2006 *)
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CROSSREFS
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Cf. A100275 = numbers n such that 9*10^n-11 is prime.
Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054, A110980.
Sequence in context: A049708 A000031 A298072 * A261751 A294679 A008324
Adjacent sequences: A111020 A111021 A111022 * A111024 A111025 A111026
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KEYWORD
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more,nonn,changed
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005
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EXTENSIONS
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Edited by N. J. A. Sloane, Apr 11 2008
a(16)-a(22) from Ray Chandler, Dec 23 2010
a(23)-a(27) from Robert Price, Jan 28 2017
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STATUS
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approved
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