18643...43049 (120-digits)

This number is a prime.

                      1864304918 6432491864 3343186434 7718643571 1864364918
6437171864 3843186437 1718643649 1864357118 6434771864 3343186432 4918643049

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The smallest Sophie Germain prime formed from the concatenation of n consecutive n-digit Honaker primes in the pattern {a, b, c, d, e, f, g, h, g, f, e, d, c, b, a}, i.e., {18643049, 18643249, 18643343, 18643477, 18643571, 18643649, 18643717, 18643843, 18643717, 18643649, 18643571, 18643477, 18643343, 18643249, 18643049}, (case n=8). [Bajpai]