Although James has correctly identified one possible answer, this question is in fact illposed as the next three terms in the sequence could be any three values. I'll demonstrate by making the next three terms N_{1 ,
}N_{2 }and N_{3. }Then the sequence could be generated as the solutions to this algebraic equation:
(x  2)(x  5)(x  10)(x  50)(x  N_{1})(x  N_{2})(x  N_{3}) = 0 where N_{1} , N_{2} and N_{3} are any numbers.
7/2/2014

Eric S.