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A108054
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Integers n such that 10^n+49 is prime.
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26
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1, 2, 3, 5, 8, 17, 24, 32, 65, 66, 67, 79, 83, 98, 152, 260, 781, 1225, 1777, 2023, 2411, 3469, 5347, 10646, 11335, 13989, 14792, 16731, 19015, 29471, 39187, 41456, 80883
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "10049".
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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 = 8 ==> 10^8+49 = 100000049, which is prime.
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MATHEMATICA
| a={}; Do[p=10^n+49; If[PrimeQ[p], AppendTo[a, n]], {n, 0, 10^3, 1}]; a - Vladimir Orlovsky, Jul 17 2008
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PROG
| (PARI) for(n=1, 1e4, if(ispseudoprime(10^n+49), print1(n", "))) \\ Charles R Greathouse IV, Jul 25 2011
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CROSSREFS
| Cf. A049054, A088274, A088275, A095688.
Sequence in context: A030034 A093000 A122630 * A123612 A077177 A145793
Adjacent sequences: A108051 A108052 A108053 * A108055 A108056 A108057
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KEYWORD
| more,nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jun 02 2005
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EXTENSIONS
| a(23) from Ray G. Opao (qzxpqbp(AT)gmail.com), Dec 13 2006
a(24)-a(31) from Robert Price (pamandbobprice(AT)yahoo.com), May 28 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
a(32) from Robert Price (pamandbobprice(AT)yahoo.com), Dec 27 2010
a(33) from Robert Price (pamandbobprice(AT)yahoo.com), Mar 03 2011
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