A075983 Primes of the form n^5 + 4^n.
5, 307, 33191, 321193, 18889465931478650198741, 401734511064747568885490523085290650630550748445707718725843
Offset: 1
Keywords
Links
- Charles R Greathouse IV, Table of n, a(n) for n = 1..7
Programs
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Mathematica
Select[Table[n^5+4^n,{n,500}],PrimeQ] (* Harvey P. Dale, Mar 31 2012 *) -
PARI
k=0; for(n=1,20,k=k+1; while(!isprime(k^5+4^k),k++); print1(k^5+4^k","))
Extensions
Next term has 193 digits.
More terms from Ralf Stephan, Mar 30 2003