A177027 Primes of the form 11^n+3^n-1.

13, 19489357, 2357967373, 23225154419887808146560828362864653

Offset

1,1

Comments

The next term (a(5)) has 133 digits. - Harvey P. Dale, Jan 18 2024

Links

Table of n, a(n) for n=1..4.

Formula

a(n) = 11^A177030(n)+3^A177030(n)-1.

Mathematica

Select[Table[11^n+3^n-1, {n, 40}], PrimeQ] (* Harvey P. Dale, Jan 18 2024 *)

Prog

(Magma) [ a: n in [0..350] | IsPrime(a) where a is 11^n+3^n-1^n]

Crossrefs

Cf. A155623, A177030

Sequence in context: A034248 A324270 A351238 * A158750 A145744 A174309

Adjacent sequences: A177024 A177025 A177026 * A177028 A177029 A177030

Keyword

nonn,less

Author

Vincenzo Librandi, Dec 09 2010

Status

approved