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 A076513 Numbers n such that 2+2^n+3^n is prime. 1
 1, 3, 5, 65, 119, 213, 1209, 2469, 2669, 3939, 11219 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 119, 213, 1209 and 2469 proved prime by Primo v1.2.1. - Robert G. Wilson v Oct 17 2002 a(12) > 10^5. - Giovanni Resta, Mar 19 2014 LINKS MATHEMATICA Do[ If[ PrimeQ[2 + 2^n + 3^n], Print[n]], {n, 1, 4000, 2}] Select[Range[10000], PrimeQ[2 + 2^# + 3^#] &] (* _Vincenzo Librandi: Oct 05 2012 *) PROG (PARI) is(n)=ispseudoprime(2+2^n+3^n) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Cf. A075996. Sequence in context: A181904 A319584 A318546 * A222611 A261071 A247862 Adjacent sequences:  A076510 A076511 A076512 * A076514 A076515 A076516 KEYWORD nonn,more AUTHOR Zak Seidov, Oct 17 2002 EXTENSIONS Edited and extended by Robert G. Wilson v, Oct 17 2002 a(10) from Vincenzo Librandi, Oct 05 2012 a(11) from Giovanni Resta, Feb 19 2013 STATUS approved

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Last modified July 2 10:39 EDT 2022. Contains 355004 sequences. (Running on oeis4.)