Puzzles

Two persons have diamonds and when they distributed each other they have one remained. If they distributed with three persons equally then also one diamond will be remained.If they distributed with four persons equally then also one diamond will be remained.
If they distributed with five persons equally then also one diamond will be remained.If they distributed with six persons equally then also one diamond will be remained.
If they distributed with seven persons then all members got equal number of diamonds.
Totally how many diamonds are there?

answer is 301.

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