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A108365
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Integers n such that 10^n - 39 is prime.
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0
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2, 5, 6, 12, 17, 19, 61, 102, 195, 447, 1250, 1329, 1935, 3930, 5837, 7176, 8724, 20881, 23936, 61868, 91920
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The next term, if one exists, is >100000. [From Robert Price (pamandbobprice(AT)yahoo.com), Apr 25 2011]
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "99961".
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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
| If n=2 then 10^n - 39 = 61 (prime).
If n=61 then 10^n - 39 = 9999999999999999999999999999999999999999999999999999999999961 (prime).
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CROSSREFS
| Cf. A108330, A108328.
Sequence in context: A023143 A085206 A058601 * A064765 A082552 A057683
Adjacent sequences: A108362 A108363 A108364 * A108366 A108367 A108368
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KEYWORD
| more,nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jul 01 2005
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EXTENSIONS
| a(8)-a(12) from Stefan Steinerberger (hansibal(AT)hotmail.com), Nov 05 2005
a(13)-a(19) from Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
a(20)=61868, a(21)=91920 from Robert Price (pamandbobprice(AT)yahoo.com), Apr 25 2011
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