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Search: id:A049054
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| A049054 |
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Numbers n such that 10^n + 3 is prime. |
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+0
24
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| 1, 2, 5, 6, 11, 17, 18, 39, 56, 101, 105, 107, 123, 413, 426, 2607, 7668, 10470, 11021, 17753, 26927
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Makoto Kamada, Factorizations of 100...003.
Sabin Tabiraca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
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5 is a member since 10^5 + 3 = 100003 is a prime.
6 is a member since 10^6 + 3 = 1000003 is a prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 10^n + 3], Print[n]], {n, 0, 18000}] (from Robert G. Wilson v Jun 15 2002)
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CROSSREFS
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Adjacent sequences: A049051 A049052 A049053 this_sequence A049055 A049056 A049057
Sequence in context: A135013 A103035 A088273 this_sequence A135476 A051217 A110975
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KEYWORD
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more,nonn
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)bvunet.net)
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 15 2002
a(16) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 09 2003
a(17) - a(20) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
26927 from Jason Earls (jcearls(AT)cableone.net), Jan 01 2008
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