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)The second and largest known probable prime (1234567..244524462445..7654321) such that the decimal concatenation of the numbers ascend from 1 up through n followed by descending numbers from n−1 down through 1, for n=2446. [Gupta]
Submitted: 2021-12-25 00:46:38; Last Modified: 2022-02-08 21:16:54.
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