

A108365


Integers n such that 10^n  39 is prime.


0



2, 5, 6, 12, 17, 19, 61, 102, 195, 447, 1250, 1329, 1935, 3930, 5837, 7176, 8724, 20881, 23936, 61868, 91920
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OFFSET

1,1


COMMENTS

The next term, if one exists, is >100000. [From Robert Price, Apr 25 2011]
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "99961".


LINKS

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


EXAMPLE

If n=2 then 10^n  39 = 61 (prime).
If n=61 then 10^n  39 = 9999999999999999999999999999999999999999999999999999999999961 (prime).


CROSSREFS

Cf. A108330, A108328.
Sequence in context: A085206 A238481 A058601 * A064765 A257805 A082552
Adjacent sequences: A108362 A108363 A108364 * A108366 A108367 A108368


KEYWORD

more,nonn


AUTHOR

Parthasarathy Nambi, Jul 01 2005


EXTENSIONS

a(8)a(12) from Stefan Steinerberger, Nov 05 2005
a(13)a(19) from Robert Price, Dec 12 2010
Edited by Ray Chandler, Dec 23 2010
a(20)=61868, a(21)=91920 from Robert Price, Apr 25 2011


STATUS

approved



