**Numbers n, not relatively prime to 10, such that the decimal form of the period of 1/n is prime.**

*12, 18, 30, 36, 45, 48, 75, 120, 180, 192, 198, 270, 288, 300, 330, 360, 450, 480, 495*

*4 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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