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 A240507 Numbers n such that 6^n - 5^n - 4^n - 3^n - 2^n - 1 is prime. 3
 4, 6, 12, 16, 34, 48, 68, 384, 1080, 5892 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(11) > 7500. All terms are even. - Jon Perry, Apr 12 2014 LINKS EXAMPLE 6^4 - 5^4 - 4^4 - 3^4 - 2^4 - 1 = 317 is prime. Thus, 4 is a member of this sequence. PROG (PARI) for(n=1, 7500, if(ispseudoprime(6^n-5^n-4^n-3^n-2^n-1), print(n))) CROSSREFS Cf. A000043, A240503. Sequence in context: A327479 A139056 A152519 * A022802 A301166 A310599 Adjacent sequences:  A240504 A240505 A240506 * A240508 A240509 A240510 KEYWORD nonn,more AUTHOR Derek Orr, Apr 06 2014 STATUS approved

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Last modified December 8 08:49 EST 2019. Contains 329862 sequences. (Running on oeis4.)