GCM in septenary base

Find the greatest common measure (GCM) of $254 1_{7}$ and $310 2_{7}$ , and express the answer in base 7.

~6 minAnswer checked instantlybase conversionGCD

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VII. Scales of Notation, Examples VII.a, No. 12

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).