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A135117
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Integers k such that 10^k + 87 is a prime number.
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1
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1, 3, 9, 19, 39, 43, 121, 153, 1243, 14445, 15273, 26779
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OFFSET
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1,2
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COMMENTS
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The next term, if one exists, is > 100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10087".
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LINKS
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Table of n, a(n) for n=1..12.
Makoto Kamada, List of near-repdigit-related prime numbers.
Index entries for primes involving repunits.
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EXAMPLE
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3 is a term because 10^3 + 87 = 1000 + 87 = 1087, which is a prime number.
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CROSSREFS
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Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.
Sequence in context: A115238 A005994 A080010 * A038163 A327381 A146819
Adjacent sequences: A135114 A135115 A135116 * A135118 A135119 A135120
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KEYWORD
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nonn,more
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AUTHOR
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Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008
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EXTENSIONS
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Term 14445 from Robert Price, Mar 22 2010
Terms 1243, 15273, 26779 from Robert Price, Oct 04 2010
Edited by Ray Chandler, Dec 23 2010
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STATUS
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approved
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