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A177027
Primes of the form 11^n+3^n-1.
1
13, 19489357, 2357967373, 23225154419887808146560828362864653
OFFSET
1,1
COMMENTS
The next term (a(5)) has 133 digits. - Harvey P. Dale, Jan 18 2024
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
KEYWORD
nonn,less
AUTHOR
Vincenzo Librandi, Dec 09 2010
STATUS
approved