Sum of 4th powers of primes dividing n.

Terms

a(0) =0a(1) =16a(2) =81a(3) =16a(4) =625a(5) =97a(6) =2401a(7) =16a(8) =81a(9) =641a(10) =14641a(11) =97a(12) =28561a(13) =2417a(14) =706a(15) =16a(16) =83521a(17) =97a(18) =130321a(19) =641a(20) =2482a(21) =14657a(22) =279841a(23) =97a(24) =625a(25) =28577a(26) =81a(27) =2417a(28) =707281a(29) =722