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A301369 Numbers n such that (9^n + 7^n)/16 is prime. 0
3, 107, 197, 2843, 3571, 4451 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are prime.

The corresponding primes are 67, 79401467172644850007356716446663549450843749853576087044440771380676673442288169290888310265443988907, ...

LINKS

Table of n, a(n) for n=1..6.

MAPLE

select(n->isprime((9^n+7^n)/16), [seq(n, n=1..10000, 2)]); # Muniru A Asiru, Mar 27 2018

MATHEMATICA

Select[Range[1, 10000], PrimeQ[(9^n+7^n)/16] &]

PROG

(PARI) forprime(n=3, 10000, if(isprime((9^n+7^n)/16), print1(n, ", ")))

(MAGMA) [n: n in [1..10000] |IsPrime((9^n+7^n)/16)]

CROSSREFS

Cf. A057175, A125956, A211409, A128339, A187819.

Sequence in context: A245657 A139921 A176807 * A142509 A023325 A094200

Adjacent sequences:  A301366 A301367 A301368 * A301370 A301371 A301372

KEYWORD

nonn,more,hard

AUTHOR

Tim Johannes Ohrtmann, Mar 19 2018

STATUS

approved

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Last modified May 26 19:44 EDT 2019. Contains 323597 sequences. (Running on oeis4.)