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A068715
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Primes of the form 10*3^k + 1.
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3
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11, 31, 271, 811, 21871, 196831, 5314411, 3874204891, 313810596091, 46383976865881019793281501678905914543189676980091, 2738927449953408337773479392637715347860807235997334411
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OFFSET
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1,1
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LINKS
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EXAMPLE
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21871 is a member as it is a concatenation of 2187 (= 3^7) and 1.
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MATHEMATICA
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PROG
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(Magma) [a: n in [0..200] | IsPrime(a) where a is 10*3^n + 1]; // Vincenzo Librandi, Dec 08 2011
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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