

A108493


Integers n such that 10^n57 is prime.


1



2, 7, 10, 11, 17, 19, 39, 49, 50, 61, 95, 106, 187, 196, 849, 889, 6436, 7370, 14446, 19647, 34399, 39922, 81297, 84305
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OFFSET

1,1


COMMENTS

Numbers corresponding to terms 849 and 889 are certified primes. (Primo 2.2.0 beta)  Ryan Propper, Jul 13 2005
No additional terms <100000.
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99943".


LINKS

Table of n, a(n) for n=1..24.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 7 is a member because: 10^757 = 1000000057 = 9999943, which is prime.


CROSSREFS

Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332, A177417.
Sequence in context: A045281 A050596 A045266 * A069494 A134712 A030344
Adjacent sequences: A108490 A108491 A108492 * A108494 A108495 A108496


KEYWORD

more,nonn,changed


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005


EXTENSIONS

a(17)a(19) from Kamada data by Robert Price, Dec 10 2010
a(20) from Kamada data by Robert Price, Dec 14 2010
a(21)a(22) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010
a(2324)=81297,84305 from Robert Price, May 29 2011


STATUS

approved



