Hi. I have run across something strange in http://oeis.org/A018786. Specifically, 'EXAMPLE ...a(2) = 7^4 + 239^4 + 157^4 + 227^4...' should be changed to, for example, 'EXAMPLE ...a(2) = 7^4 + 239^4 = 157^4 + 227^4...', since a(2) = 3262811042 and 7^4 + 239^4 + 157^4 + 227^4 = 6525622084 (= 2* 3262811042). Sincerely, Kohji Suzuki