66666...66667 (1204-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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6_n 7 is prime for n=1203. Its square, 4_n+1 8_n 9, is an integer of 2408 digits, free of the digits 6 and 7. [Rivera]

Submitted: 2019-03-24 15:40:40; Last Modified: 2019-03-24 16:41:11.