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 A114301 Numbers n such that 2^n + 3^n + 5^n + 7^n is a prime number. 0
 1, 3, 19, 1013, 4133, 9833, 30809 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS All terms are odd. - Robert Israel, May 03 2018 LINKS EXAMPLE 2^3 + 3^3 + 5^3 + 7^3 = 503 (prime), thus 3 is in the sequence. MAPLE select(t -> isprime(2^t+3^t+5^t+7^t), [seq(i, i=1..10000, 2)]); # Robert Israel, May 03 2018 MATHEMATICA Do[If[PrimeQ[2^n+3^n+5^n+7^n], Print[n]], {n, 1, 5000}] CROSSREFS Sequence in context: A168591 A319190 A014015 * A258669 A192340 A326973 Adjacent sequences:  A114298 A114299 A114300 * A114302 A114303 A114304 KEYWORD hard,more,nonn AUTHOR Stefan Steinerberger, Feb 05 2006 EXTENSIONS a(6) from Ryan Propper, Mar 24 2006 a(7) from Joao Carlos Leandro da Silva (zxawyh66(AT)yahoo.com), Jun 01 2009 STATUS approved

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Last modified May 16 14:39 EDT 2021. Contains 343949 sequences. (Running on oeis4.)