11011...11011 (25-digits)

This number is a prime.

                                                 11011 1101100900 1101111011

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The smallest "almost plus sign prime" of order 5. Note that its sum of digits is equal to its length. (An almost plus sign prime is a plus sign prime having a distinct central digit.

1 1 0 1 1
1 1 0 1 1
0 0 9 0 0
1 1 0 1 1
1 1 0 1 1