71407...56441 (28-digits)
This number is a prime.
71407021 6903678666 7065556441
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The smallest prime formed from reverse concatenation of the seven consecutive triangular numbers, i.e., 7140,7021,6903,6786,6670,6555 and 6441. [Gupta]
Submitted: 2020-06-24 10:58:11; Last Modified: 2020-06-24 14:50:41.
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