OFFSET
1,1
COMMENTS
The next term (a(10)) has 97 digits. - Harvey P. Dale, Sep 13 2018
MATHEMATICA
Join[{5}, Select[Table[10*FromDigits[PadRight[{4}, n, 8]]+9, {n, 50}], PrimeQ]] (* Harvey P. Dale, Sep 13 2018 *)
PROG
(Magma) [a: n in [0..250]|IsPrime(a) where a is (44*10^n+1)div(9)]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 11 2010
STATUS
approved