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# 39311171399719337397

`3931117139 9719337397`

Just showing those entries submitted by 'Rivera': (Click here to show all)

A composite string S formed from the digits 1, 3, 7 and 9. There are 74 primes embedded in S, read left-to-right only. This is the maximal quantity known for 20 digits. Found by Dmitry Kamenetsky. [Rivera]

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