411728896domain: NAppears in sequencesa(n) = n^n^n^n^n^n^n^n^n^n^... read mod 10^10.at n=3A165736Numbers x = concat(a,b) such that a^b ends with the digits of x.at n=23A273383Values of n such that 4^n ends in n, or expomorphic numbers in base 4.at n=8A288845