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Column S contains the check sums of the values given in columns R and Xc. Does anyone here have an idea about how to find the corresponding algorithm to calculate the check sums? Thanks in advance

    R    Xc   S
   647   72   218
   441   47   618
   594   67   188
   581   55   517
   497   58   865
   553   65   661
   541   52   309

Best regards,

Holzi

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closed as off-topic by Yuval Filmus, Rick Decker, Evil, David Richerby, Juho Mar 28 '17 at 13:14

This question appears to be off-topic. The users who voted to close gave this specific reason:

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