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Integers n such that 10^n-17 is prime.
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%I #23 Jan 17 2019 13:44:08

%S 2,3,6,30,40,86,128,264,639,912,1932,4650,5038,7410,19041

%N Integers n such that 10^n-17 is prime.

%C Terms 639 and 912 correspond to certified primes (Primo 2.2.0 beta). - _Ryan Propper_, Jul 12 2005

%C No other terms < 40000.

%C See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99983".

%C No other terms < 100,000. - _Robert Price_, Mar 03 2011

%H Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>.

%H <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.

%e If n = 3 we have 10^3-17 = 1000-17 = 983, which is prime.

%Y Cf. A089675, A095714, A092767.

%K more,nonn

%O 1,1

%A Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005

%E a(14)-a(15) from _Robert Price_, Dec 11 2010

%E Edited by _Ray Chandler_, Dec 23 2010