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A107083
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Integers n such that 10^n+31 is prime.
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24
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1, 2, 3, 14, 18, 44, 54, 89, 469, 2060, 2985, 6197, 16452, 19393, 21205, 49657, 74670, 76374
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The next term, if one exists, is >100000. [From Robert Price (pamandbobprice(AT)yahoo.com), Apr 26 2011]
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "10031".
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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
| For n = 3 we get 10^3+31 = 1000+31 = 1031, which is prime.
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MATHEMATICA
| a={}; Do[If[PrimeQ[p=10^n+31], AppendTo[a, n]], {n, 0, 6*10^2}]; a [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 07 2008]
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CROSSREFS
| Cf. A049054, A088274, A088275, A095688, A108052, A108050, A108049, A108054.
Sequence in context: A041869 A041010 A041733 * A160218 A081615 A157903
Adjacent sequences: A107080 A107081 A107082 * A107084 A107085 A107086
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KEYWORD
| more,nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jun 08 2005
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EXTENSIONS
| Added two terms: 16452,19393. Robert Price (pamandbobprice(AT)yahoo.com), Mar 22 2010
Additional term (21205). Robert Price (pamandbobprice(AT)yahoo.com), May 24 2010
Missing term (6197) added by Robert Price (pamandbobprice(AT)yahoo.com), Dec 07 2010
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
a(16)=49657 from Robert Price (pamandbobprice(AT)yahoo.com), Dec 31 2010
a(17)=74670 from Robert Price (pamandbobprice(AT)yahoo.com), Jan 29 2011
a(18)=76374 from Robert Price (pamandbobprice(AT)yahoo.com), Mar 03 2011
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