OFFSET
1,1
COMMENTS
Next term has 355 digits.
All terms are of the form 6x+1; a(4) has 823 digits; and there are no further terms up to and including 10000 digits. - Harvey P. Dale, Oct 03 2018
MATHEMATICA
Select[Table[FromDigits[PadRight[{}, 6n+1, {1, 4, 2, 8, 5, 7}]], {n, 200}], PrimeQ](* Harvey P. Dale, Oct 03 2018 *)
CROSSREFS
KEYWORD
nonn,base,bref
AUTHOR
Felix Fröhlich, May 23 2014
STATUS
approved