The On-Line Encyclopedia of Integer Sequences (OEIS)

A128340 revision #5

A128340

Numbers n such that (11^n + 5^n)/16 is prime.

7, 11, 181, 421, 2297, 2797, 4129, 4139, 7151, 29033

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OFFSET

1,1

COMMENTS

All terms are primes.

a(11) > 10^5 - Robert Price, Feb 09 2013

LINKS

MATHEMATICA

k=11; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n, 1, 100}]

CROSSREFS

KEYWORD

hard,more,nonn

AUTHOR

EXTENSIONS

a(5)-a(10) from Robert Price, Feb 09 2013

STATUS

proposed