

A178438


Numbers n such that 10^n  83 is prime.


0



2, 6, 16, 42, 47, 62, 109, 191, 221, 509, 3671, 4229, 4886, 6967, 12086
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OFFSET

1,1


COMMENTS

The next term, if one exists, is > 100000.  Robert Price, Apr 25 2011
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99917".


LINKS

Table of n, a(n) for n=1..15.
Makoto Kamada, List of nearrepdigitrelated prime numbers
Index entries for primes involving repunits


EXAMPLE

10^6  83 = 999917 which is a prime number.


MATHEMATICA

nMax=1000; Do[If[PrimeQ[10^n83], Print[n]], {n, nMax}]


PROG

(PARI) is(n)=ispseudoprime(10^n83) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A108330, A108328.
Sequence in context: A276359 A158920 A263592 * A143123 A102699 A266124
Adjacent sequences: A178435 A178436 A178437 * A178439 A178440 A178441


KEYWORD

more,nonn


AUTHOR

Robert Price, Dec 21 2010


EXTENSIONS

Example corrected by Patrick De Geest, Nov 28 2014


STATUS

approved



