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Search: id:A107083
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| A107083 |
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Integers n such that 10^n+31 is prime. |
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+0
25
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| 1, 2, 3, 14, 18, 44, 54, 89, 469, 2060, 2985
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Some of the larger entries may only correspond to probable primes.
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EXAMPLE
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For n = 3 we get 10^3+31 = 1000+31 = 1031, which is prime.
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MATHEMATICA
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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
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Cf. A049054, A088274, A088275, A095688, A108052, A108050, A108049, A108054.
Sequence in context: A041869 A041010 A041733 this_sequence A081615 A024478 A025090
Adjacent sequences: A107080 A107081 A107082 this_sequence A107084 A107085 A107086
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KEYWORD
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hard,more,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Jun 08 2005
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