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A111022
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Integers n such that 8*10^n+21 is prime.
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0
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2, 4, 10, 40, 55, 162, 264, 506, 870, 948, 1339, 3587, 6428
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable/proven prime - search on "80021".
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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 = 4 is a member because: 8*10^4+21 = 8*10000+21 = 80000+21 = 80021, which is prime.
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CROSSREFS
| Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054, A110980.
Sequence in context: A109460 A108801 A193675 * A086852 A084737 A153757
Adjacent sequences: A111019 A111020 A111021 * A111023 A111024 A111025
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KEYWORD
| more,nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005
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EXTENSIONS
| a(13) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 23 2010
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