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Search: id:A113480
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| A113480 |
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Numbers n such that 17^n+2 is prime. |
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+0
7
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OFFSET
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1,3
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COMMENT
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Only numbers of the form 6k-5 and 6k-3 need be tested.
Next term, if exists, is > 2500. - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jan 28 2006
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MATHEMATICA
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Do[If[PrimeQ[17^n + 2], Print[n]], {n, 0, 2500}] (Steinerberger)
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PROGRAM
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(PARI) g2(n)= { print1(0", "); forstep(x=1, n, 6, if(ispseudoprime(17^x+2), print1(x", ")); if(ispseudoprime(17^(x+2)+2), print1(x+2", ")) ) }
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CROSSREFS
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Sequence in context: A075764 A046299 A010090 this_sequence A102792 A013594 A136418
Adjacent sequences: A113477 A113478 A113479 this_sequence A113481 A113482 A113483
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jan 09 2006
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