

A108328


Integers n such that 10^n  23 is a prime number.


16



3, 11, 17, 23, 35, 161, 765, 3473, 6887, 27681, 34313
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OFFSET

1,1


COMMENTS

No additional terms < 40000.  Robert Price, Dec 13 2010
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99977".
No other terms < 100,000.  Robert Price, Mar 03 2011


LINKS

Table of n, a(n) for n=1..11.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 3 is a member because 10^3  23 = 1000  23 = 977, which is prime.


MATHEMATICA

lst={}; Do[If[PrimeQ[10^n23], AppendTo[lst, n]], {n, 0, 10^4}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 19 2008 *)


CROSSREFS

Cf. A089675, A095714, A092767.
Sequence in context: A165561 A038960 A019397 * A153419 A079020 A118590
Adjacent sequences: A108325 A108326 A108327 * A108329 A108330 A108331


KEYWORD

more,nonn


AUTHOR

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


EXTENSIONS

a(9)a(11) from Robert Price, Dec 13 2010
Edited by Ray Chandler, Dec 23 2010


STATUS

approved



