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A108328
Integers n such that 10^n - 23 is a prime number.
16
3, 11, 17, 23, 35, 161, 765, 3473, 6887, 27681, 34313
OFFSET
1,1
COMMENTS
No additional terms < 40000. - Robert Price, Dec 13 2010
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99977".
No other terms < 100,000. - Robert Price, Mar 03 2011
EXAMPLE
n = 3 is a member because 10^3 - 23 = 1000 - 23 = 977, which is prime.
MATHEMATICA
lst={}; Do[If[PrimeQ[10^n-23], AppendTo[lst, n]], {n, 0, 10^4}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 19 2008 *)
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
EXTENSIONS
a(9)-a(11) from Robert Price, Dec 13 2010
Edited by Ray Chandler, Dec 23 2010
STATUS
approved