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

Author

Vincenzo Librandi, Oct 01 2012

Keywords

• nonn

Comments

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

Crossrefs

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

Programs

Mathematica

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

PARI

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

Extensions

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