0,1

Prime versus probable prime status and proofs are given in the author's table.

P. De Geest, SUPP Reference Table

a(n)=51 -> (31*10^51-13)/99 = 313131313131313131313131313131313131313131313131313.

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A078674 A071094 A144987 this_sequence A045489 A145242 A075869

Adjacent sequences: A062213 A062214 A062215 this_sequence A062217 A062218 A062219

nonn,base

Patrick De Geest (pdg(AT)worldofnumbers.com) and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001.