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 A113480 Numbers n such that 17^n + 2 is prime. 8
 0, 1, 105, 369, 25521 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Only numbers of the form 6k-5 and 6k-3 need be tested. No further terms < 100000. - Ray Chandler, Jul 31 2011 a(6) > 2*10^5. - Robert Price, Oct 23 2014 LINKS Henri & Renaud Lifchitz, PRP Records. MATHEMATICA Do[If[PrimeQ[17^n + 2], Print[n]], {n, 0, 2500}] (* Stefan Steinerberger, Jan 28 2006 *) PROG (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", ")) ) } CROSSREFS Sequence in context: A147576 A145752 A195266 * A190577 A102792 A013594 Adjacent sequences:  A113477 A113478 A113479 * A113481 A113482 A113483 KEYWORD nonn AUTHOR Cino Hilliard, Jan 09 2006 EXTENSIONS 25521 from Ray Chandler, Jul 30 2011 STATUS approved

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Last modified August 20 18:56 EDT 2019. Contains 326154 sequences. (Running on oeis4.)