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A108326
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Integers n such that 10^n-17 is prime.
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0
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2, 3, 6, 30, 40, 86, 128, 264, 639, 912, 1932, 4650, 5038, 7410, 19041
(list;
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listen;
history;
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internal format)
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OFFSET
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1,1
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COMMENTS
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Terms 639 and 912 correspond to certified primes (Primo 2.2.0 beta). - Ryan Propper, Jul 12 2005
No other terms < 40000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99983".
No other terms < 100,000. - Robert Price, Mar 03 2011
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LINKS
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Table of n, a(n) for n=1..15.
Makoto Kamada, List of near-repdigit-related prime numbers.
Index entries for primes involving repunits.
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EXAMPLE
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If n = 3 we have 10^3-17 = 1000-17 = 983, which is prime.
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CROSSREFS
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Cf. A089675, A095714, A092767.
Sequence in context: A051717 A330030 A192441 * A002234 A074005 A145499
Adjacent sequences: A108323 A108324 A108325 * A108327 A108328 A108329
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KEYWORD
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more,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
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EXTENSIONS
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a(14)-a(15) from Robert Price, Dec 11 2010
Edited by Ray Chandler, Dec 23 2010
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STATUS
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approved
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