10141...14571 (231-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                                                     1 0141514571 1014137215
3101412297 3610141087 3201014094 4905101408 0249110140 6600781014 0517666101
4037525510 1402328451 0140090436 1014023284 5101403752 5510140517 6661014066
0078101408 0249110140 9449051014 1087320101 4122973610 1413721531 0141514571

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The smallest prime formed from the concatenation of n consecutive n-digit triangular numbers in the pattern {k, j, i, h, g, f, e, d, c, b, a, b, c, d, e, f, g, h, i, j, k}, i.e., {10141514571, 10141372153, 10141229736, 10141087320, 10140944905, 10140802491, 10140660078, 10140517666, 10140375255, 10140232845, 10140090436, 10140232845, 10140375255, 10140517666, 10140660078, 10140802491, 10140944905, 10141087320, 10141229736, 10141372153, 10141514571}, (case n=11). [Bajpai]