

A110918


Integers n such that 10^n+91 is a prime number.


2



1, 2, 3, 4, 11, 12, 15, 19, 136, 144, 732, 5774, 6602, 23499, 39583, 74254, 93356, 94016
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OFFSET

1,2


COMMENTS

No additional terms < 100000.
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "10091".


LINKS

Table of n, a(n) for n=1..18.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 4 is a member: 10^4+91 = 10000+91 = 10091, which is prime.


MATHEMATICA

Select[Range[2000], PrimeQ[10^# + 91] &] (* Vincenzo Librandi, Nov 02 2014 *)


PROG

(MAGMA) [n: n in [1..400] IsPrime(10^n+91)]; // Vincenzo Librandi, Nov 02 2014


CROSSREFS

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.
Sequence in context: A084544 A268236 A039023 * A181542 A160914 A155768
Adjacent sequences: A110915 A110916 A110917 * A110919 A110920 A110921


KEYWORD

more,nonn,changed


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005


EXTENSIONS

a(1)=1 added by Vladimir Joseph Stephan Orlovsky, May 02 2008
a(12)a(15) from Robert Price, Dec 12 2010
Edited by Ray Chandler, Dec 23 2010
a(16)=74254 from Robert Price, Mar 03 2011
a(17)=92178 and a(18)=94016 from Robert Price, Apr 19 2011
a(17)=93356 corrected by Robert Price, Apr 19 2011


STATUS

approved



