Suppose the post office only sold 5 cent and 7 cent stamps. Now, if the amount of postage on your mail had to be a precise amount equivalent to double of the distance (e.g. sending a letter five miles costs ten cents), what whole number locations are you not able to mail to?

Suppose the post office only sold 5 cent and 7 cent stamps. Now, if the amount of postage on your mail had to be a precise amount equivalent to double of the distance (e.g. sending a letter five miles costs ten cents), what whole number locations are you not able to mail to?

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