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A095304 Smallest prime of the form k^n-2. 4
2, 7, 727, 79, 241, 727, 823541, 5764799, 19681, 16679880978199, 31381059607, 13841287199, 42052983462257057, 6103515623, 4747561509941, 28644003124274380508351359, 98526125335693359373 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(7)=7^7-2=823541 is prime whereas 3^7-2=2185 and 5^7-2=78123 are composite.

CROSSREFS

Cf. A095303 smallest k such that k^n-2 is prime, A087576 smallest k such that k^n+2 is prime, A095302 corresponding primes.

Sequence in context: A073698 A073860 A093926 * A065590 A051249 A056165

Adjacent sequences:  A095301 A095302 A095303 * A095305 A095306 A095307

KEYWORD

nonn

AUTHOR

Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 01 2004

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.