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A213216 Numbers n such that (12^n + 11^n)/23 is prime. 6
47, 401, 509, 8609 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are prime.

a(5) > 10^5.

LINKS

Table of n, a(n) for n=1..4.

MATHEMATICA

Select[ Prime[ Range[1, 100000] ], PrimeQ[ (12^# + 11^#)/23 ]& ]

PROG

(PARI) is(n)=ispseudoprime((12^n+11^n)/23) \\ Charles R Greathouse IV, Feb 20 2017

CROSSREFS

Cf. A057178, A128341, A181141, A187819, A217095.

Sequence in context: A244770 A255141 A142694 * A324625 A239539 A217119

Adjacent sequences:  A213213 A213214 A213215 * A213217 A213218 A213219

KEYWORD

hard,nonn,more

AUTHOR

Robert Price, Mar 02 2013

EXTENSIONS

Removed incorrect first term of "2".

STATUS

approved

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Last modified May 23 19:07 EDT 2019. Contains 323528 sequences. (Running on oeis4.)