12234...43221 (49-digits)

This number is a prime.

                       122344445 6666667888 8888898888 8888766666 6544443221

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

+ A prime formed from the nine digits in ascending and descending concatenation, the even digits repeated themselves times. [Silva]

(There are 3 curios for this number that have not yet been approved by an editor.)

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