Smarandache-Wellin number
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In mathematics, a Smarandache-Wellin number is an integer that in a given base is the concatenation of the first n prime numbers written in that base. A Smarandache-Wellin number that is also prime is called a Smarandache-Wellin prime.
The first Smarandache-Wellin numbers are 2, 23, 235, 2357, 235711, ... (sequence in OEIS); the first few indices n of Smarandache-Wellin numbers that are prime are 1, 2, 4, 128, 174, 342, ... .
References
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