Denominator of sum of -4th powers of divisors of n.

Terms

a(0) =1a(1) =16a(2) =81a(3) =256a(4) =625a(5) =648a(6) =2401a(7) =4096a(8) =6561a(9) =5000a(10) =14641a(11) =3456a(12) =28561a(13) =19208a(14) =50625a(15) =65536a(16) =83521a(17) =104976a(18) =130321a(19) =80000a(20) =194481a(21) =117128a(22) =279841a(23) =165888a(24) =390625a(25) =228488a(26) =531441a(27) =43904a(28) =707281a(29) =202500