A166241 Primes of the form a(n) = 3^n + 5^n + 7^n.

3, 83, 292299923, 684331371443, 191640836307771341507, 9388970456309004899603, 30363584636685952989516426809065192841572196335875312999038527044324069339846978313376123672504677550327603

Offset: 1

Author

Zak Seidov, Oct 09 2009

Keywords

• nonn

Comments

The next term has 435 digits. - Harvey P. Dale, Apr 06 2015

Crossrefs

Cf. A160773 (corresponding values of n).

Programs

Magma

[ a: n in [0..450]|IsPrime(a) where a is 3^n+5^n+7^n] // Vincenzo Librandi, Dec 08 2010

Mathematica

Select[Table[3^n+5^n+7^n,{n,0,200}],PrimeQ] (* Harvey P. Dale, Apr 06 2015 *)