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Search: id:A089379
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| A089379 |
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Numbers n such that 10^n+n is prime. |
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+0
1
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OFFSET
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1,2
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EXAMPLE
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a(2)=9 because 10^9+9 is prime.
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MATHEMATICA
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Do[If[Mod[n, 3]!=2&& PrimeQ[10^n+n], Print[n]], {n, 1, 15500, 2}] - Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 11 2006
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CROSSREFS
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Cf. A110066.
Sequence in context: A091708 A024119 A120306 this_sequence A072258 A125372 A165147
Adjacent sequences: A089376 A089377 A089378 this_sequence A089380 A089381 A089382
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KEYWORD
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nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Dec 27 2003
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EXTENSIONS
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One more term from Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 11 2006
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