

A108312


Integers n such that 10^n + 27 is prime.


14




OFFSET

1,2


COMMENTS

The next term, if one exists, is >100000.  Robert Price, May 24 2010
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "10027".


LINKS

Table of n, a(n) for n=1..7.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

For n=2 we have 10^2 + 27 = 100 + 27 = 127, which is prime.


MATHEMATICA

Do[ If[ PrimeQ[10^n + 27], Print[n]], {n, 3000}] (* Robert G. Wilson v, Jul 01 2005 *)


CROSSREFS

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.
Sequence in context: A090434 A062603 A007353 * A175449 A171399 A037069
Adjacent sequences: A108309 A108310 A108311 * A108313 A108314 A108315


KEYWORD

more,nonn,changed


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 29 2005


EXTENSIONS

a(6)=14081 from Robert Price, Mar 22 2010
Edited by Ray Chandler, Dec 23 2010
a(7)=65537 from Robert Price, Jan 29 2011


STATUS

approved



