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

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..7.

Mathematica

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

Prog

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

Crossrefs

Cf. A160773 (corresponding values of n).

Sequence in context: A093166 A111648 A013518 * A140158 A160875 A081542

Adjacent sequences: A166238 A166239 A166240 * A166242 A166243 A166244

Keyword

nonn

Author

Zak Seidov, Oct 09 2009

Status

approved