A217134 Numbers n such that 5^n - 8 is prime.

2, 4, 10, 14, 88, 112, 140, 764, 3040, 11096, 24934, 25616, 54584, 93400

Offset

1,1

Comments

a(15) > 10^5. - Robert Price, Feb 03 2014

Links

Table of n, a(n) for n=1..14.

Mathematica

Select[Range[2, 5000], PrimeQ[5^# - 8] &]

Prog

(PARI) for(n=2, 5*10^3, if(isprime(5^n-8), print1(n", ")))

Crossrefs

Cf. A059613, A087885, A089142, A109080, A124621, A165701.

Sequence in context: A351160 A056392 A080149 * A351927 A333619 A128513

Adjacent sequences: A217131 A217132 A217133 * A217135 A217136 A217137

Keyword

nonn

Author

Vincenzo Librandi, Oct 01 2012

Extensions

a(10)-a(14) from Robert Price, Feb 03 2014

Status

approved