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A108493
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Integers n such that 10^n-57 is prime.
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1
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2, 7, 10, 11, 17, 19, 39, 49, 50, 61, 95, 106, 187, 196, 849, 889, 6436, 7370, 14446, 19647, 34399, 39922, 81297, 84305
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers corresponding to terms 849 and 889 are certified primes. (Primo 2.2.0 beta) - Ryan Propper (rpropper(AT)stanford.edu), Jul 13 2005
No additional terms <100000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "99943".
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LINKS
| Makoto Kamada, List of near-repdigit-related prime numbers.
Index entries for primes involving repunits.
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EXAMPLE
| n = 7 is a member because: 10^7-57 = 10000000-57 = 9999943, which is prime.
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CROSSREFS
| Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332.
Sequence in context: A045281 A050596 A045266 * A069494 A134712 A030344
Adjacent sequences: A108490 A108491 A108492 * A108494 A108495 A108496
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KEYWORD
| more,nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005
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EXTENSIONS
| a(17)-a(19) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
a(20) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010
a(21)-a(22) from Robert Price (pamandbobprice(AT)yahoo.com), Dec 15 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
a(23-24)=81297,84305 from Robert Price (pamandbobprice(AT)yahoo.com), May 29 2011
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