35711...91391 (102-digits)

This number is a prime.

                                         35 7113171913 2921373143 4743595167
6173797389 8791013017 0190131172 1131731931 9411517513 6176137197 1181191391

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The smallest non-trivial prime formed from the concatenation of the digit reversal of the first n odd primes, i.e., {3, 5, 7, 11, 31, 71, ..., 181, 191, 391}, (case n=43). [Bajpai]