

A111023


Integers n such that 9*10^n + 11 is a prime number.


0



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

1,2


COMMENTS

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


LINKS

Table of n, a(n) for n=1..27.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 6 is a member because 9*10^6 + 11 = 9*1000000 + 11 = 9000011, which is prime.


MATHEMATICA

Do[If[PrimeQ[9*10^n+11], Print[n]], {n, 1, 1300}] (* Zak Seidov, Sep 14 2006 *)


CROSSREFS

Cf. A100275 = numbers n such that 9*10^n11 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


KEYWORD

more,nonn,changed


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005


EXTENSIONS

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


STATUS

approved



