A068367 Numbers n such that phi(n)^2+sigma(n)^2 is prime.

1, 4, 8, 25, 50, 121, 225, 324, 400, 800, 1024, 1250, 1681, 1682, 2025, 2209, 4761, 5041, 5625, 6561, 6724, 7569, 11449, 17424, 18225, 18769, 21609, 26244, 34969, 36481, 38809, 42050, 59858, 62001, 72900, 90000, 102152, 108900