A138917 Primes of the form (7^n - 3^n)/4.

79, 205339, 2849723505777919, 32630698480032300363207829406924223200028691707999878933118763629424475875983590509549306981, 127580191747195202924309312459314208655999588495944426207896494224749946405733526219402133007132444053184501199

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Keywords

• nonn

Crossrefs

Cf. A128024.

Programs

Mathematica

a={};Do[p=(7^n-3^n)/4;If[PrimeQ[p],AppendTo[a,p]],{n,0,13^2}];a