Numbers k such that sigma(k) and phi(k) are both perfect cubes.

Terms

a(0) =1a(1) =300118a(2) =2250885a(3) =5294800a(4) =76336260a(5) =141483384a(6) =242375035a(7) =453280968a(8) =456345036a(9) =461356896a(10) =478240392a(11) =537375930a(12) =1139523375a(13) =1180718238a(14) =1227111595a(15) =1599634410a(16) =5043835125a(17) =5229921340a(18) =5610392513a(19) =6087775939a(20) =6376494509a(21) =11038341720a(22) =11044670824