The Rajya Sabha (meaning the "Council of States") is the upper house of the Parliament of India.
Sikkim elects 1 seat and it is indirectly elected by the state legislators of Sikkim, since year 1976.
[1] The number of seats, allocated to the party, are determined by the number of seats, a party possesses during nomination and the party nominates a member to be voted on.
Elections in within the state legislatures are held using Single transferable vote with proportional representation.
Source:[2] * Indicates current member