This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).
Single Curio View: (Seek other curios for this number)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 10:40:40; Last Modified: 2019-03-24 11:41:11.
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