Sum of 4th powers of odd primes dividing n.

Terms

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