A number 
such that the last digits of 
are the same as 
. 49 is trimorphic since 
(Wells 1986, p. 124). The first few are 1,
4, 5, 6, 9, 24, 25, 49, 51, 75, 76, 99, 125, 249, 251, 375, 376, 499, ... (OEIS A033819).
Trimorphic Number
See also
Automorphic Number, Narcissistic Number, Super-d NumberExplore with Wolfram|Alpha
References
Sloane, N. J. A. Sequence A033819 in "The On-Line Encyclopedia of Integer Sequences."Wells, D. The Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England: Penguin Books, 1986.Referenced on Wolfram|Alpha
Trimorphic NumberCite this as:
Weisstein, Eric W. "Trimorphic Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/TrimorphicNumber.html