1427

This number is a prime.

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Smallest prime formed by concatenating the self powers of numbers, i.e., 1^1, 2^2 , 3^3, ... . [Sariyar]

The only known prime formed by the concatenation of the first terms in the Pillai sequence. Note that the concatenation of two Turkish cities, Sivas and Ankara, form a substring of his middle name (Subbayya Sivasankaranarayana Pillai). [Sariyar]