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 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 (list; graph; refs; listen; history; text; internal format)
 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 near-repdigit-related 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 A326377 Adjacent sequences: A110915 A110916 A110917 * A110919 A110920 A110921 KEYWORD more,nonn 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

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Last modified October 4 20:53 EDT 2023. Contains 365888 sequences. (Running on oeis4.)