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

79, 205339, 2849723505777919, 32630698480032300363207829406924223200028691707999878933118763629424475875983590509549306981, 127580191747195202924309312459314208655999588495944426207896494224749946405733526219402133007132444053184501199

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Mathematica

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

Crossrefs

Cf. A128024.

Sequence in context: A251365 A023343 A265465 * A265589 A116327 A060711

Adjacent sequences: A138914 A138915 A138916 * A138918 A138919 A138920

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 16 2008

Status

approved