71407...56441 (28-digits)

This number is a prime.

                                              71407021 6903678666 7065556441

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

+ The smallest prime formed from reverse concatenation of the seven consecutive triangular numbers, i.e., 7140,7021,6903,6786,6670,6555 and 6441. [Gupta]

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