

A108329


Integers n such that 10^n27 is prime.


3



2, 4, 7, 14, 20, 22, 29, 31, 40, 80, 85, 224, 767, 952, 3592, 4016, 4187, 9239, 17684, 20716, 30791
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OFFSET

1,1


COMMENTS

See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99973".
The next term, if one exists, is >100000. [From Robert Price, Apr 25 2011]


LINKS

Table of n, a(n) for n=1..21.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 7 is a member because: 10^727 = 1000000027 = 9999973, which is prime.


CROSSREFS

Cf. A089675, A095714, A092767, A176987.
Sequence in context: A133638 A018505 A280430 * A057264 A045514 A102957
Adjacent sequences: A108326 A108327 A108328 * A108330 A108331 A108332


KEYWORD

more,nonn


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005


EXTENSIONS

a(18)a(19) from Kamada data by Robert Price, Dec 10 2010
a(20)a(21) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010


STATUS

approved



