(343)^p/3 ×7^2p-1/(49)^p×^p+1
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(7p)^3 + (1)^3 + 3(7p)^2 + 3(7p)(1)^2
(7p+1)^3
(7p+1) (7p+1) (7p+1)
(7p+1)^3
(7p+1) (7p+1) (7p+1)
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