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 A108052 Integers n such that 10^n+19 is a prime number. 27
 1, 3, 5, 7, 10, 11, 17, 59, 81, 108, 574, 629, 1069, 1759, 2063, 2682, 9174, 40929, 42457, 66033 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Verified terms through 9174. - Robert Price, May 24 2010 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10019". No other terms <= 100,000. - Robert Price, Mar 03 2011 LINKS Makoto Kamada, List of near-repdigit-related prime numbers. EXAMPLE n = 7 we have 10^7+19 = 10000000+19 = 10000019, which is prime. MATHEMATICA Select[Range[2*10^3], PrimeQ[10^#+19]&] - Vladimir Joseph Stephan Orlovsky, Apr 29 2008 PROG (PARI) is(n)=ispseudoprime(10^n+19) \\ Charles R Greathouse IV, Apr 28 2015 CROSSREFS Cf. A049054, A088274, A088275, A095688. Sequence in context: A189009 A206812 A189372 * A046868 A225240 A104309 Adjacent sequences:  A108049 A108050 A108051 * A108053 A108054 A108055 KEYWORD more,nonn AUTHOR Julien Peter Benney (jpbenney(AT)ftml.net), Jun 01 2005 EXTENSIONS a(17)=9174 from Ryan Propper, Jan 02 2008 Edited by Ray Chandler, Dec 23 2010 a(18)=40929 and a(19)=42457 from Robert Price, Dec 27 2010 a(20)=66033 from Robert Price, Jan 09 2011 STATUS approved

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Last modified November 15 01:01 EST 2018. Contains 317224 sequences. (Running on oeis4.)