This number is a prime.
The only Cyclops prime p of the for x^4 + 3*x*y + y^4: (for x=15; y=4). Curiously, sod(p) is an emirp (i.e., 13). [Bajpai]
The only Cyclops prime p of the for x^4 + 3*x*y + y^4: (for
x=15; y=4). Curiously, sod(p) is an emirp (i.e., 13). [Bajpai]