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 A288491 Numbers k such that k^k*prime(k) - 1 is prime. 0
 2, 6, 40, 56, 954 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(6) > 22000. - Giovanni Resta, Jun 12 2017 LINKS EXAMPLE a(1) = 2 because 3*2^2-1 = 11 a prime. a(2) = 6 because 13*6^6-1 = 606527 a prime. MATHEMATICA Select[Range[1000], PrimeQ[Prime[#] #^# - 1] &] PROG (MAGMA)  [n: n in [1..1000] | IsPrime(NthPrime(n)*n^n-1)]; CROSSREFS Cf. A086173. Sequence in context: A340299 A068207 A331702 * A212883 A336959 A027161 Adjacent sequences:  A288488 A288489 A288490 * A288492 A288493 A288494 KEYWORD nonn,more AUTHOR Vincenzo Librandi, Jun 10 2017 STATUS approved

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Last modified January 27 15:45 EST 2022. Contains 350607 sequences. (Running on oeis4.)