665545362821

This number is a prime.

66 5545362821

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The Smallest prime formed from reverse concatenation of six consecutive triangular numbers, i.e., 66, 55, 45, 36, 28 and 21. [Gupta]

Submitted: 2019-04-28 18:48:50; Last Modified: 2019-04-28 23:02:24.