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 A270104 Numbers n such that 3^n + n*2^n is prime. 1
 1, 2, 7, 8, 13, 43, 55, 59, 145, 149, 545, 2468, 4049, 4055, 15653, 22765 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(17) > 30000. - Giovanni Resta, May 05 2016 LINKS EXAMPLE n = 2 is a term since 3^2 + 2*2^2 = 17 is prime. MATHEMATICA Select[Range[1000], PrimeQ[3^# + # * 2^#]&] (* Giovanni Resta, May 05 2016 *) PROG (MATLAB) if isprime(3^n + n*2^n) disp(n) end (PARI) is(n)=ispseudoprime(3^n+n*2^n) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Cf. A270102, A123924. Sequence in context: A004717 A308918 A226819 * A063531 A063771 A064293 Adjacent sequences:  A270101 A270102 A270103 * A270105 A270106 A270107 KEYWORD nonn,more AUTHOR Vardan Semerjyan, Mar 11 2016 EXTENSIONS a(15)-a(16) from Giovanni Resta, May 05 2016 STATUS approved

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Last modified May 18 10:28 EDT 2022. Contains 353807 sequences. (Running on oeis4.)