The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A108332 Integers k such that 10^k - 89 is prime. 2
 2, 3, 637, 2349, 29455 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 637 corresponds to a certified prime (Primo 2.2.0 beta). - Ryan Propper, Nov 06 2005 No additional terms < 40000. See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "9w11". LINKS Makoto Kamada, List of near-repdigit-related prime numbers. EXAMPLE k = 3 is a term because 10^3 - 89 = 1000 - 89 = 911, which is prime. MATHEMATICA Do[If[PrimeQ[10^n - 89], Print[n]], {n, 2, 10^4}] (* Ryan Propper *) CROSSREFS Cf. A089675, A095714, A092767. Sequence in context: A264577 A165770 A226148 * A256115 A066685 A076155 Adjacent sequences:  A108329 A108330 A108331 * A108333 A108334 A108335 KEYWORD nonn,more AUTHOR Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005 EXTENSIONS a(5) from Robert Price, Dec 15 2010 Edited by Ray Chandler, Dec 23 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 19 13:00 EDT 2021. Contains 343114 sequences. (Running on oeis4.)