10360...27461 (49-digits)

This number is a prime.

                       103608010 3464110332 0310317661 0303301028 8951027461

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The smallest prime formed from the reverse concatenation of n consecutive n-digit triangular numbers, i.e., {1036080, 1034641, 1033203, 1031766, 1030330, 1028895, 1027461}, (case n=7). [Bajpai]