Numbers n such that gcd(sigma(n), n) > gcd(sigma(m), m) for all m < n.

Terms

a(0) =1a(1) =6a(2) =24a(3) =28a(4) =120a(5) =496a(6) =672a(7) =4320a(8) =4680a(9) =8128a(10) =26208a(11) =30240a(12) =32760a(13) =174592a(14) =199584a(15) =293760a(16) =435708a(17) =523776a(18) =2142720a(19) =2178540a(20) =8910720a(21) =17428320a(22) =20427264a(23) =23569920a(24) =33550336a(25) =45532800a(26) =91963648a(27) =142990848a(28) =459818240a(29) =1379454720