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 A268065 Integers k such that 2^k + 3^k + 5^k + k is prime. 2
 0, 1, 3, 7, 19, 33, 1363, 6663 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Next term, if it exists, is greater than 30000. - Vaclav Kotesovec, Jan 26 2016 LINKS EXAMPLE k=3: 2^3+3^3+5^3+3 = 163. MATHEMATICA Select[Range[0, 2000], PrimeQ[2^# + 3^# + 5^# + #] &] (* Vaclav Kotesovec, Jan 25 2016 *) PROG (PARI) lista(nn) = for(n=0, nn, if(ispseudoprime(2^n + 3^n + 5^n + n), print1(n, ", "))); \\ Altug Alkan, Jan 25 2016 CROSSREFS Cf. A076515, A268067. Sequence in context: A112633 A113916 A227502 * A049490 A112391 A127928 Adjacent sequences:  A268062 A268063 A268064 * A268066 A268067 A268068 KEYWORD nonn,more AUTHOR Emre APARI, Jan 25 2016 EXTENSIONS a(7) from Vaclav Kotesovec, Jan 25 2016 STATUS approved

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Last modified July 30 19:15 EDT 2021. Contains 346359 sequences. (Running on oeis4.)